CN106700252A - Alloy material for automobile hub decoration cover and preparation method of alloy material - Google Patents
Alloy material for automobile hub decoration cover and preparation method of alloy material Download PDFInfo
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- CN106700252A CN106700252A CN201611148081.5A CN201611148081A CN106700252A CN 106700252 A CN106700252 A CN 106700252A CN 201611148081 A CN201611148081 A CN 201611148081A CN 106700252 A CN106700252 A CN 106700252A
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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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 decoration cover. The alloy material comprises the following raw materials by weight percentage: 30-50% of polypropylene, 10-30% of polyamide, 10-25% of a compound interfacial compatibilizer and 10-30% of an inorganic filling body; the compatibilizer comprises a polypropylene graft and an acrylic acid segmented copolymer. The invention also provides a preparation method of the alloy material. The mixed polypropylene, polyamide and compound interfacial compatibilizer are put into a main feeding bin of a tightly meshed co-rotating twin screw extruder, and are added into a cylinder of the extruder through a feeding screw, the inorganic filling body is added into the extruder from a lateral feeding port, and the alloy material for the automobile hub decoration cover is obtained after melt extrusion, cooling, pelleting, and drying. The tensile strength and the bending strength of the alloy material are both close to those of a wet polyamide material, furthermore, the flexural modulus is increased by 150% or above and is as high as 3800 MPa, and meanwhile, the shrinking percentage of the material is low.
Description
Technical field
The invention belongs to chemical field, it is related to a kind of alloy material, specifically a kind of automotive hub decorative cover
Alloy material and preparation method thereof.
Background technology
Polyamide PA is a kind of common engineering plastics, and its high mechanical properties, shock resistance, heat resistance are good, are usually used in vapour
The products such as car engine periphery product, automobile interior exterior decorations；But because the amide group contained by it has stronger polarity, Yi Yushui
Molecule forms hydrogen bond action, and the mechanical property for causing material is greatly lowered, product deformation is serious, common solution be plus
Enter a certain amount of inorganic mineral filler, its water imbibition is reduced to a certain extent, but this is inevitably to the intensity band of material
To negatively affect.
Polypropylene PP is nonpolar general-purpose plastics, not polar functionalities in its strand, thus water imbibition, solvent resistance
Polyamide is significantly better than that, and due to its micro-structural rule, easy rule is piled up and forms crystallization, therefore, with than routine
The more preferable mechanical property of olefin polymer, and remain the good processing fluidity of polyolefine material and with low cost excellent
Gesture.
With continuing to develop for auto industry in recent years, lightweight, the idea of development of environmental protection are increasingly rooted in the hearts of the people, to vapour
The performance of car parts material is it is also proposed that new requirement.Processing stabilization height (more than 250~260 DEG C) and processing of polyamide
Window is narrower, and depolymerization is easily caused if temperature is too high, and product is also scrapped therewith, so as to produce on material, the energy
Dual waste.Automotive hub decorative cover is mounted to the ornamental member on the outside of automotive hub, and its mechanical property requirements is not as
Engine circumferential component is so high with polyamide material, and from the point of view of the performance standard of major main engine plants, the hygrometric state power of polyamide
Performance indications or relatively low are learned, this is that PP type alloy material replacement polyamide material provides good prerequisite.
From the point of view of existing polypropylene/polyamide alloy material, due to both greatest differences in the chemically, its dispersed phase point
Cloth situation and alternate compatibility are the failure to the technical of effective solution always.The hydrolysis that CN201510618103 is described is resistance to old
It is exactly to improve the mechanical property of alloy material and resistance to by compatilizer, interface stability agent to change polyamide polynropylene alloy material
Polypropylene content is less in hydrolysis ageing-resistant performance, but alloy system, and the improved meaning of chemical-resistant stability is relatively bigger, is similar to
Research be also shown in the low water absorbable PA66 polypropylene alloy materials described in CN201110062768.From the point of view of to sum up, real meaning
High-performance polypropylene/polyamide alloy in justice is always the field of currently associated research institute's shorter mention, if can be in mechanical property
Can, the aspect such as product outward appearance and size, weather resistance have breakthrough, it will be opened in automobile lightweight, environmental protection new material
Extensive use is obtained in hair and application.
The content of the invention
For above-mentioned technical problem of the prior art, the invention provides a kind of alloy material of automotive hub decorative cover
And preparation method thereof, described alloy material of this automotive hub decorative cover and preparation method thereof will solve of the prior art
Its mechanical property of the alloy material of wheel hub decorative cover and the not good technical problem of chemical stability.
The invention provides a kind of alloy material of automotive hub decorative cover, including following percentage by weight raw material：
Described polypropylene be homo-polypropylene, its under 230 DEG C, the test condition of 2.16Kg, its melt index be 30~
100g/10min；
Described Compositional type Interfacial compatibilization agent is made up of Graft Polypropylene and acrylic compounds segmented copolymer, described
The mass ratio of Graft Polypropylene and acrylic compounds segmented copolymer is 5~10：5~15；
Described Graft Polypropylene is maleic anhydride inoculated polypropylene PP-MAH or methyl methacrylate-grafted
The combination of any one or two kinds in PP-GMA, is 0.8~1.5% through chemical determination grafting rate；
Described acrylic compounds segmented copolymer is polymetylmethacrylate, ethene-vinyl acetate copolymer
Appointing in EVA, ethylene-methacrylic acid copolymer EMA or methacrylic acid-butadiene-styrene terpolymer MBS
Anticipate one or more combination；
Described inorganic fill body is nanoscale talcum powder, magnesium salt whisker, calcium sulfate crystal whiskers, potassium titanate crystal whisker or receives
Any one in rice silicon carbide whisker or two or more combinations.
Further, described polyamide is polyamide 6, and melt viscosity scope is 0.5~6.
Further, the melt viscosity scope of described polyamide 6 is 2~4.
Present invention also offers a kind of preparation method of the alloy material of above-mentioned automotive hub decorative cover, including following step
Suddenly：
1) polypropylene, polyamide, Compositional type Interfacial compatibilization agent are weighed by described percentage by weight, are then well mixed,
Obtain mixed material；
2) inorganic fill body is weighed in proportion；
3) dried mixed material is positioned in the main feeding bin for tightly engaging parallel dual-screw extruding machine, through feeding
Screw rod is added in the machine barrel of extruder, and inorganic fill body is added in extruder from side spout, extruder screw diameter
It is 40mm, draw ratio L/D is 56, and each zone temperature of main barrel is exported from charge door to head and is set as：160℃、190℃、
220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, engine speed is 300 revs/min, through melting extrusion, cooling, granulation, drying
The alloy material of automotive hub decorative cover is obtained after treatment.
The present invention is aided with special inorganic fill by selection, the collocation of efficient, stabilization multicomponent Interfacial compatibilization agent
Body, and proper ratio polyamide, obtained modified polypropylene composite material is possessed more conventional polypropylene material higher
Intensity index is as stretched, bending strength, and main inflexible target such as bending modulus also has and significantly lifted, and the processing of material is flowed
Property compared with polyamide material more preferably, process window is wider, and melt property is more stable, while the dimensional characteristic of material such as shrinkage factor, line
Property coefficient of expansion CLTE it is similar with conventional polyamide compoiste material, main engine plants of the country such as general, popular, lucky can be met
On automotive hub decorative cover proprietary material standard.
High-performance polypropylene/polyamide alloy material of the invention, from mechanical property, processing performance, long-term weatherability
Property etc. aspect possess substitute automobile decoration piece polyamide compoiste material possibility.First, polypropylene/polyamide alloy material
Alternate compatibility have and be obviously improved, by taking the elongation at break of material as an example, select reasonable species, consumption Compositional type interface
The formula materials of bulking agent, its tensile strength is also promoted to more than 40MPa from 30MPa or so, the drawing with hygrometric state polyamide material
Stretch intensity to approach, main inflexible target such as bending modulus is promoted to 3800MPa or so, the polyamide apparently higher than hygrometric state is answered
The corresponding index of condensation material, the shrinkage factor of polypropylene/polyamide alloy material is maintained between 0.4-0.6%, the test of CLTE
Value is also very close in polyamide material, it should be pointed out that the water absorption rate of polypropylene/polyamide alloy material has significantly
Reduction, only 0.08%~0.15%, this is that property retention rate of the product in practical service environment, dimensional stability improve
Good material foundation is provided.
The present invention is compared with prior art, and its technological progress is significant.Mechanics of the present invention for automotive hub decorative cover
Performance and practical service environment demand, traditional polyamides is substituted with the polypropylene/polyamide alloy material of high-performance, high durable
Amine material, it is proposed that Compositional type Interfacial compatibilization agent, improves emphatically the alternate compatibility and dispersion rational behavior of polymer alloy；With
Specific inorganic fill body substitutes common mineral filler, with preferably increasing firm effect；The polypropylene of gained/polyamide is closed
Primary intensity the index such as tensile strength, bending strength of gold are superior to hygrometric state polyamide material and approach, and bending modulus is even more on year-on-year basis
Lifting more than 150%, reaches as high as 3800MPa or so, while Material shrinkage rate is low, dimensional stability is special with wheel hub decorative cover poly-
Amide material is similar to, but processing, Shooting Technique condition milder, stabilization, is a kind of with conspicuous characteristics, high comprehensive performance, Yi Jia
The dedicated modified material of automobile exterior trimming parts of work.
Specific embodiment
Below by specific embodiment, the present invention is described further, and the embodiment is merely to illustrate this hair
It is bright rather than limitation of the present invention.
The embodiment of the present invention is raw materials used：
PP:Homo-polypropylene, crystallinity Xc >=65%, South Korea PolyMirae, melt index MFR are 120g/10min (230
℃、2.16Kg)。
PA-1：Polyamide 6, melt relative viscosity 2.45, the prosperous profit polymerization Co., Ltd in Ningbo.
PA-2：Polyamide 6, melt relative viscosity 1.0, the U.S. is bright to contain chemistry.
Graft Polypropylene -1：Maleic anhydride inoculated polypropylene PP-MAH 1001, grafting rate 1.0%, Shang Hai Zhuang scapes
Work.
Graft Polypropylene -1：Maleic anhydride inoculated polypropylene PP-MAH 5001C, grafting rate 0.8%, the liter of Nantong day
Company.
Acrylic compounds segmented copolymer -1：Methyl methacrylate PMMA CM 205, Zhenjiang very beautifies.
Acrylic compounds segmented copolymer -2：Ethene-vinyl acetate copolymer EVA-460, VA content 60%, Mitsui
Chemistry.
Inorganic fill body -1：HAR T84,10000 mesh, high compression level, Wuxi Heng Mao Trade Co., Ltd.s.
Inorganic fill body -2：Nanoscale talcum powder (model HTP05), 10000 mesh, Italian AIHAI-IMI.
Inorganic fill body -3：Calcium sulfate crystal whiskers, upper seapeak Zhu whisker Co., Ltd.
Properties of product are tested：
Tensile property：Carried out by ISO527-2 standards, test rate is 5mm/min.
Bending property：Carried out by IS178 standards, span is 64mm, test rate is 2mm/min.
Impact property：Carried out on impact tester for simple supported beam by ISO179-1 standards, batten breach is A types.
Shrinkage factor is tested：Tested by ISO 294-4 standards, standard jig is 210 × 140 × 3.2mm.
Linear expansion coefficient CLTE is tested：Carried out on TMA-600 instruments, it is -30 DEG C~120 DEG C that test is interval, is heated up
Speed is 1 DEG C/min.
Water absorption rate test：During standard impulse batten is positioned over into 23 DEG C, the environment of 50%RH, test bars weight after 24h
Change, obtains water absorption rate after calculating.
Embodiment 1
Data according to embodiment 1 in table 1 weigh maleic anhydride inoculated polypropylene PP-MAH 1001, polymethylacrylic acid
Methyl esters CM 205, is uniformly mixed, you can Compositional type Interfacial compatibilization agent 1 is obtained.
Embodiment 2
Data according to embodiment 2 in table 1 weigh maleic anhydride inoculated polypropylene PP-MAH 5001, ethane-acetic acid ethyenyl
EVA-460, is uniformly mixed, you can Compositional type Interfacial compatibilization agent 2 is obtained.
Embodiment 3
Data according to embodiment 3 in table 1 weigh maleic anhydride inoculated polypropylene PP-MAH 1001, ethane-acetic acid ethyenyl
EVA-460, is uniformly mixed, you can Compositional type Interfacial compatibilization agent 3 is obtained.
Embodiment 4
Data according to embodiment 3 in table 1 weigh maleic anhydride inoculated polypropylene PP-MAH 5001, polymethylacrylic acid
Methyl esters CM 205, is uniformly mixed, you can Compositional type Interfacial compatibilization agent 4 is obtained.
Embodiment 5
Data according to embodiment 3 in table 1 weigh maleic anhydride inoculated polypropylene PP-MAH 1001, polymethylacrylic acid
Methyl esters CM 205, ethane-acetic acid ethyenyl EVA-460, are uniformly mixed, you can Compositional type Interfacial compatibilization agent 5 is obtained.
Formula table (the unit of the inorganic enhancing system of the Compositional type of table 1：Gram)
Embodiment 6
Each component is weighed by the data of embodiment 6 shown in table 2, by each component beyond inorganic fill body in mixed at high speed
It is well mixed in machine, is put into the main feeding bin of double screw extruder, inorganic fill body puts into side feeding bin, extruder spiral shell
Shank diameter is 40mm, and draw ratio L/D is 56, and engine speed is set as 300 revs/min, and each zone temperature of main barrel is (from charging
Mouth is exported to head) it is set as：160 DEG C, 190 DEG C, 220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, through melting extrusion, cold
But, product is obtained after the operation such as granulation, drying and processing.
Formula table (the unit of the special PP composite material of the car thin-wall bumper of table 2：Gram)
Embodiment 7
Each component is weighed by the data of embodiment 7 shown in table 2, by each component beyond inorganic fill body in mixed at high speed
It is well mixed in machine, is put into the main feeding bin of double screw extruder, inorganic fill body puts into side feeding bin, extruder spiral shell
Shank diameter is 40mm, and draw ratio L/D is 56, and engine speed is set as 300 revs/min, and each zone temperature of main barrel is (from charging
Mouth is exported to head) it is set as：160 DEG C, 190 DEG C, 220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, through melting extrusion, cold
But, product is obtained after the operation such as granulation, drying and processing.
Embodiment 8
Each component is weighed by the data of embodiment 8 shown in table 2, by each component beyond inorganic fill body in mixed at high speed
It is well mixed in machine, is put into the main feeding bin of double screw extruder, inorganic fill body puts into side feeding bin, extruder spiral shell
Shank diameter is 40mm, and draw ratio L/D is 56, and engine speed is set as 300 revs/min, and each zone temperature of main barrel is (from charging
Mouth is exported to head) it is set as：160 DEG C, 190 DEG C, 220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, through melting extrusion, cold
But, product is obtained after the operation such as granulation, drying and processing.
Embodiment 9
Each component is weighed by the data of embodiment 9 shown in table 2, by each component beyond inorganic fill body in mixed at high speed
It is well mixed in machine, is put into the main feeding bin of double screw extruder, inorganic fill body puts into side feeding bin, extruder spiral shell
Shank diameter is 40mm, and draw ratio L/D is 56, and engine speed is set as 300 revs/min, and each zone temperature of main barrel is (from charging
Mouth is exported to head) it is set as：160 DEG C, 190 DEG C, 220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, through melting extrusion, cold
But, product is obtained after the operation such as granulation, drying and processing.
Embodiment 10
Each component is weighed by the data of embodiment 10 shown in table 2, each component beyond inorganic fill body is mixed in high speed
It is well mixed in conjunction machine, is put into the main feeding bin of double screw extruder, inorganic fill body puts into side feeding bin, extruder
Screw diameter is 40mm, and draw ratio L/D is 56, and engine speed is set as 300 revs/min, each zone temperature of main barrel (from plus
Material mouth is exported to head) it is set as：160 DEG C, 190 DEG C, 220 DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, through melting extrusion, cold
But, product is obtained after the operation such as granulation, drying and processing.
Comparative example 1
45 grams of PP, 20 grams of PA6-1,10 grams of Graft Polypropylenes -1,25 grams of inorganic fill body -1 are weighed, by inorganic fill body
Each component in addition is well mixed in high-speed mixer, in putting into the main feeding bin of double screw extruder, inorganic fill body
Side feeding bin is put into, extruder screw a diameter of 40mm, draw ratio L/D are 56, and engine speed is set as 300 revs/min, master
Each zone temperature (being exported from charge door to head) of machine barrel is set as：160℃、190℃、220℃、235℃、230℃、230
DEG C, 230 DEG C, obtain product after the operations such as melting extrusion, cooling, granulation, drying and processing.
Comparative example 2
45 grams of PP, 20 grams of PA6-2,10 grams of Graft Polypropylenes -2,25 grams of inorganic fill body -2 are weighed, by inorganic fill body
Each component in addition is well mixed in high-speed mixer, in putting into the main feeding bin of double screw extruder, inorganic fill body
Side feeding bin is put into, extruder screw a diameter of 40mm, draw ratio L/D are 56, and engine speed is set as 300 revs/min, master
Each zone temperature (being exported from charge door to head) of machine barrel is set as：160℃、190℃、220℃、235℃、230℃、230
DEG C, 230 DEG C, obtain product after the operations such as melting extrusion, cooling, granulation, drying and processing.
Comparative example 3
The wheel hub decorative cover modified polyamide composite of common designations, the trade mark is A3ZM2, and BASF Corp. of Germany provides,
The commercially available trade mark.
The performance test results of the special PP composite material of the car thin-wall bumper of table 3
From the point of view of the performance test of each embodiment and comparative example shown in table 3, using heretofore described Compositional type circle
Each embodiment of face bulking agent, it is relatively viscous with the regulation of more preferable interface, reinforcing using conventional compatibilizing method (comparative example 1,2)
The effects such as knot, the distributed dimension for improving dispersed phase, the tensile strength of material is considerably higher, most of all in more than 30MPa, highest
Up to 43-45MPa, the hygrometric state tensile strength material modified with PA6 shown in comparative example 3 is substantially suitable；Further, since filling
The reasonably combined of body is used, and the improved effect in interface is further played, and the bending modulus of material has and significantly lifted, with
PA6 shown in comparative example 3 material modified bending modulus (1730MPa) is compared, and bending modulus is ranged up in embodiment 10
3770MPa, lifting amplitude nearly 150%, and the introducing of polypropylene matrix, also cause that the water imbibition of alloy material significantly drops
It is low, from PA6 it is material modified 0.35% be down to 0.1% or so, this is for polypropylene/polyamide alloy material in actual environment
Possess good property retention rate, dimensional stability there is provided good prerequisite, material C LTE test values are also considerably lower,
To solve product injection after because caused by changes in environmental conditions the problem of appearance such as size expansion, contraction play the role of it is positive.Separately
Outward, it is worth mentioning at this point that, modified polyamide material is substituted with polypropylene/polyamide alloy material, injection temperature, pressure,
The links such as process-cycle have different improvements, and temperature, pressure are lower, and, without post processing, the process-cycle is also therewith for product
Shorten, this just reflects the design concept of " lightweight, environmental protection " that current car industry is advocated, be a kind of green, environmental protection
Automobile new function ornament materials, possess fabulous social benefit and market popularization value.
Claims (4)
1. a kind of alloy material of automotive hub decorative cover, it is characterised in that：Raw material including following percentage by weight：
Polypropylene 30 ~ 50%；
Polyamide 10 ~ 30%；
Compositional type Interfacial compatibilization agent 10 ~ 25%；
Inorganic fill body 10 ~ 30%；
Described polypropylene is homo-polypropylene, and under 230 DEG C, the test condition of 2.16Kg, its melt index is 30 ~ 100 g/ for it
10min；
Described Compositional type Interfacial compatibilization agent is made up of Graft Polypropylene and acrylic compounds segmented copolymer, and described poly- third
The mass ratio of alkene graft and acrylic compounds segmented copolymer is 5 ~ 10：5~15；
Described Graft Polypropylene is any one in maleic anhydride inoculated polypropylene or methyl methacrylate-grafted
Or two kinds of combination, it is 0.8 ~ 1.5% through chemical determination grafting rate；
Described acrylic compounds segmented copolymer is polymethyl methacrylate, ethene-vinyl acetate copolymer, ethene-first
In base acrylic copolymer or methacrylic acid-butadiene-styrene terpolymer any one or it is two or more
Combination；
Described inorganic fill body is nanoscale talcum powder, magnesium salt whisker, calcium sulfate crystal whiskers, potassium titanate crystal whisker or nano-sized carbon
Any one in SiClx whisker or two or more combinations.
2. the alloy material of a kind of automotive hub decorative cover according to claim 1, it is characterised in that：Described polyamide
It is polyamide 6, melt viscosity scope is 0.5 ~ 6.
3. the alloy material of a kind of automotive hub decorative cover according to claim 2, it is characterised in that：Described polyamide
6 melt viscosity scope is 2 ~ 4.
4. the preparation method of the alloy material of a kind of automotive hub decorative cover described in claim 1, it is characterised in that：Including with
Lower step：
1）Polypropylene, polyamide, Compositional type Interfacial compatibilization agent are weighed by described percentage by weight, is then well mixed, obtained
Mixed material；
2）Inorganic fill body is weighed in proportion；
3）Dried mixed material is positioned in the main feeding bin for tightly engaging parallel dual-screw extruding machine, through feed screw
It is added in the machine barrel of extruder, inorganic fill body is added in extruder from side spout, extruder screw is a diameter of
40mm, draw ratio L/D are 56, and each zone temperature of main barrel is exported from charge door to head and is set as：160℃、190℃、220
DEG C, 235 DEG C, 230 DEG C, 230 DEG C, 230 DEG C, engine speed be 300 revs/min, through melting extrusion, cooling, granulation, drying and processing
The alloy material of automotive hub decorative cover is obtained afterwards.
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