CN105778297A - Polypropylene (PP) composite material used for thin-wall bumpers and preparation method thereof - Google Patents
Polypropylene (PP) composite material used for thin-wall bumpers and preparation method thereof Download PDFInfo
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- CN105778297A CN105778297A CN201610192931.5A CN201610192931A CN105778297A CN 105778297 A CN105778297 A CN 105778297A CN 201610192931 A CN201610192931 A CN 201610192931A CN 105778297 A CN105778297 A CN 105778297A
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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
- C08L23/14—Copolymers of propene
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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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
Abstract
The invention relates to a polypropylene (PP) composite material used for thin-wall bumpers and a preparation method thereof. The PP composite material comprises the following raw materials in parts by weight: 40-70 parts of PP, 15-35 parts of compound inorganic reinforcing system, 8-15 parts of toughening agents and 5-10 parts of interface modification additives. The PP composite material has the positive effects that the compound inorganic reinforcing system is provided aiming at the problem of lack of rigidity, traditional mineral powder filling modified PP composite materials are difficult to meet the thin-wall requirements of large parts of automobiles, and a well and reasonably distributed inorganic reinforcing system structure with a good interface is jointly built with the assistance of the interface modification additives; the bending property of the obtained PP composite material is improved by more than 80% compared with the bending properties of traditional materials, and the maximum bending modulus can be 3300MPa; and meanwhile, the PP composite material maintains good notch impact resistance, has low shrinkage, has excellent dimensional stability in high and low temperature environments and is a modified material which is specially used for thin-wall bumpers and has outstanding characteristics and good comprehensive properties.
Description
Technical field
The invention belongs to technical field of polymer materials, be specifically related to a kind of PP composite material for car thin-wall bumper and preparation method thereof.
Background technology
Polypropylene PP is a kind of wide variety of general-purpose plastics, its molecular chain structure rule, easy rule is piled up and is formed crystallization, therefore, compared with the polythene PE that chemical constitution is similar, it has better mechanical property, good chemical stability, and remain the good processing fluidity of polyolefine material and advantage with low cost, thus at automobile, electronic apparatus, the field extensive application such as construction material, particularly in auto parts and components field, no matter it is inside gadget, exterior trimming parts or functor, piece weight is big, the raw material that baroque product is mostly is preferential selection with polypropylene and modified composite thereof.
But; development along with auto industry in recent years; lightweight, environmental protection idea of development be day by day rooted in the hearts of the people; to auto parts and components by raw-material performance it is also proposed that higher requirement; such as bumper and lower to large-sized structural parts or functors such as plaque, instrument board and skeleton, door trim, front end frame, skylight sash; high-performance, diversified Novel polypropylene base modified composite material be applied in continuous expansion, its prospect is also extensively had an optimistic view of.For the front/rear collision bumper of automobile, its piece weight big (4-5Kg) and lateral dimension very long (>=1m), it is one of the focus of current automotive light weight technology research, and its maximally effective loss in weight is exactly thin-walled property design.Current conventional beam design wall thickness is 2.8～3.2mm; and if wall thickness can be reduced to 1.8～2.2mm; 1/3 can not only be reduced on part weight; realize the lightweight of vehicle structure; reduce Fuel consumption; and, also can reduce molding cycle and the injection moulding glue consumption of product, possess dual environmental protection effect.Raw-material property indices especially mechanical property is had higher requirement by the reduction of wall thickness without query, and the dimensional stability under such as bending modulus >=2500MPa, and room temperature and low temperature to wait well.The current above-mentioned standard of bumper material contrast, there is also modulus low, processing fluidity is inadequate, molding and post-shrinkage ratio are bigger than normal, the performance deficiencies such as under environment size is unstable, a kind of high-impact bumper mentioned by CN201510365616, its notch impact strength paying attention to improve material, and material stiffness is not improved or in a slight decrease, it is only applicable to the bumper material of general thickness design；Although the polypropylene modified composite material rigidity described in CN201510194220 is obviously improved, but toughness is inadequate and Material shrinkage rate is higher, and dimensional stability is not good enough；Thin-wall bumper PP composite material described in CN201010196779, its bending modulus is only at about 2000MPa, and notch shock is relatively low (30kJ/m2Left and right), dimensionally stable test is also unsatisfactory, it is difficult to tackle the bumper for car that ultralow thickness (about 2.0mm) designs.
From the above, the thin-walled property design of bumper is not that the rigidity promoting material simply is to realize product thickness, the reduction of weight, and should be possess good shock resistance at guarantee insurance thick stick, under the premise of dimensional stability, improve rigidity and the processing fluidity of material as far as possible, the molding cycle making product shortens and possesses good shape support effect, to meet the light-weight design requirement of automobile, this just formula selection to polypropylene modified material, especially strengthen system to select, arranging effect between component, interface compatibilities etc. propose high requirement.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that a kind of PP composite material for car thin-wall bumper and preparation method thereof.Selected and composite by inorganic reinforcement targetedly, it is aided with the use of interface modification auxiliary agent, and special high-toughness thermoplastic elastomer, make the inflexible target such as bending modulus of the modified polypropylene composite material prepared, the more conventional material of processing fluidity index such as melting means MFR have significantly to promote, the toughness index such as notch impact strength of composite is held essentially constant or slightly improves simultaneously, the shrinkage factor of material is low, good stability of the dimension, can meet the associated materials standard of each famous brand main engine plants.
It is an object of the invention to be achieved through the following technical solutions:
The first object of the present invention is in that to provide a kind of PP composite material for car thin-wall bumper, including the raw material of following weight portion:
The inorganic enhancing system of described Compositional type is made up of inorganic mineral fiber and the Pulvis Talci that number is 5000～10000 orders；Wherein, inorganic mineral fiber 7～20 weight portion, Pulvis Talci 8～15 weight portion.
Further, described polypropylene is COPP, 230 DEG C, under the test condition of 2.16Kg, its melt index is 30～120g/10min.
Further, one or more in basalt fibre, silicon carbide fibre, calcium sulfate crystal whiskers, alumina whisker of described inorganic mineral fiber, fibre diameter is 1～10um, and draw ratio is 1:50～1:500.
Further, in described Pulvis Talci, dioxide-containing silica >=60wt%, content of magnesia >=30wt%.
Further, described toughener selected from polyolefin elastomer, SBS, SEBS one or more；190 DEG C, under the test condition of 2.16Kg, melt index is 0.5～10g/min.
Further, described interface modification auxiliary agent in maleic anhydride inoculated polypropylene, the nano-synergistic master batch M2007 one or both；Wherein, the percent grafting of maleic anhydride inoculated polypropylene is 0.5%～2%, and the solids content of nano-synergistic master batch M2007 is 10wt%～20wt%.
The second object of the present invention is in that the preparation method providing a kind of PP composite material for car thin-wall bumper, comprises the following steps:
(1) first weigh polypropylene, toughener and interface modification auxiliary agent, mix homogeneously by following weight portion, obtain mixed material, then weigh the inorganic enhancing system of Compositional type again；
The inorganic enhancing system of described Compositional type is made up of inorganic mineral fiber and the Pulvis Talci that number is 5000～10000 orders；Wherein, inorganic mineral fiber 7～20 weight portion, Pulvis Talci 8～15 weight portion；
(2) by dried for above-mentioned mixed material, it is placed in the main feeding bin of meshing co rotating twin screw extrusion, join in the machine barrel of extruder through feed screw, inorganic for Compositional type enhancing system is joined extruder from side spout, extruder screw diameter is 35mm, draw ratio L/D is 40, each zone temperature that main barrel exports from charge door to head is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, engine speed is 250 revs/min, through melt extruding, cooling down, pelletize, drying and processing, prepare PP composite material.
By the high-performance modified polypropylene composite that technical scheme prepares, possesses the performance characteristic of " high rigidity, high-impact, high fluidity ", better should design lower thin-wall bumper to raw-material performance indications requirement, the composite strengthening system that specific aim of having given prominence to the key points the selects improvement to PP composite material rigidity by right automotive light weight technology.The more conventional material of bending modulus of composite has the increase rate of more than 80%, and the processing fluidity of material is obviously improved, and melting means MFR is at more than 30g/10min, and conventional material promotes nearly one times on year-on-year basis, and the notch impact strength of material is maintained at 35kJ/mAbout 2, main performance indications can meet the design requirement of ultralow thickness (2.0mm) bumper；On the other hand, the shrinkage factor of modified material is down to 0.35～0.5 from the 0.8～1.2 of common designations, under high and low temperature environment, the linear expansion coefficient of (-30 DEG C～120 DEG C) is also at 35～50um/ (m DEG C), show excellent dimensional stability, this is between the such coarse scale structures of bumper, being very important performance characteristic, this performance PP composite material of modified gained can extensively should in the front/rear collision bumper of domestic and international Ge great main engine plants and lower to the external ornamentation such as plaque, side skirt.
Compared with prior art, the positive effect of the present invention is as follows:
The present invention is directed to the rigidity of traditional breeze filled modified polypropylene composite not enough, it is difficult to the thin-walled property demand of the reply large-scale product of automobile, propose the inorganic enhancing system of Compositional type, and the inorganic reinforcement architecture that under the auxiliary of interface modification auxiliary agent, common structure is well distributed rationally, interface is excellent.The bending property of the PP composite material of gained relatively traditional material improves more than 80%, bending modulus reaches as high as 3300MPa, it is maintained with good notched-impact resistance energy, and Material shrinkage rate is low, high and low temperature environment is provided with the dimensional stability of excellence, is the dedicated modified material of thin-walled property bumper of a kind of with conspicuous characteristics, high comprehensive performance.
Detailed description of the invention
Below by specific embodiment, the present invention is described further, and described embodiment is merely to illustrate the present invention rather than limitation of the present invention.
The embodiment of the present invention is raw materials used:
PP-1: COPP, crystallinity Xc >=45%, SK Chemical of Korea S, melt index MFR is 60g/10min (230 DEG C, 2.16Kg).
PP-2: HOPP, crystallinity Xc >=70%, Korea S PolyMirae, melt index MFR is 120g/10min (230 DEG C, 2.16Kg).
Inorganic mineral fiber-1: basalt fibre, diameter is 6um, and draw ratio is 1:250, Zhejiang Shijin Basalt Fiber Co., Ltd.
Inorganic mineral fiber-2: calcium sulfate crystal whiskers NP-MO2, diameter 1～4um, draw ratio is 1:40～1:80, upper seapeak Zhu whisker trade Co., Ltd.
High mesh number Pulvis Talci-1:SK6500,5000 orders, Haicheng elite mineral products company limited.
High mesh number Pulvis Talci-2:HTP05,10000 orders, Italy AIHAI-IMI.
Common Pulvis Talci: JM-209,1250 orders, Haicheng Jin Tian stone powder factory.
Special toughener-1: polyolefin elastomer-8407, DOW Chemical, melt index MFR is 30g/10min (190 DEG C, 2.16Kg).
Special toughener-2: styrene analog thermoplastic elastomer SBS-YH503, middle petrochemical industry Ba Ling company limited, melt index 3g/min (190 DEG C, 2.16Kg).
Interface modification auxiliary agent-1: maleic anhydride inoculated polypropylene CMG-5001, the liter new material company limited of Nantong day, test chemical percent grafting is 0.8%.
Interface modification auxiliary agent-2: nano-synergistic master batch M2007, Suzhou Nakangnami Materials Co., Ltd., solids content is 15wt%.
Properties of product are tested:
Melt flow rate (MFR) is tested；By ISO1133-1 standard testing, test condition is 230 DEG C, 2.26Kg.
Tensile property: undertaken by ISO527-2 standard, test rate is 5mm/min.
Bending property: undertaken by IS178 standard, span is 64mm, and test rate is 2mm/min.
Impact property: carry out on impact tester for simple supported beam by ISO179-1 standard, batten breach is A type.
Shrinkage factor is tested: testing by ISO294-4 standard, standard jig is 210 × 140 × 3.2mm.
Linear expansion coefficient CLTE tests: carry out on TMA-600 instrument, and test interval is-30 DEG C～120 DEG C, and heating rate is 1 DEG C/min.
Embodiment 1
Weigh basalt fibre, calcium sulfate crystal whiskers NP-MO2 according to the data of embodiment 1 in table 1, be uniformly mixed, can be prepared by the inorganic enhancing system 1 of Compositional type.
Embodiment 2
Weigh basalt fibre, calcium sulfate crystal whiskers NP-MO2 according to the data of embodiment 2 in table 1, be uniformly mixed, can be prepared by the inorganic enhancing system 2 of Compositional type.
Embodiment 3
Weigh calcium sulfate crystal whiskers NP-MO2, Pulvis Talci SK6500 according to the data of embodiment 3 in table 1, be uniformly mixed, can be prepared by the inorganic enhancing system 3 of Compositional type.
Embodiment 4
Weigh calcium sulfate crystal whiskers NP-MO2, Pulvis Talci HTP05 according to the data of embodiment 3 in table 1, be uniformly mixed, can be prepared by the inorganic enhancing system 4 of Compositional type.
The formula table of the inorganic enhancing system of table 1 Compositional type (unit: gram)
Embodiment 5
Each component is weighed by embodiment 5 data shown in table 2, by each component mix homogeneously in high-speed mixer beyond inorganic for Compositional type enhancing system, put in the main feeding bin of double screw extruder, inorganic enhancing system puts into side feeding bin, extruder screw diameter is 35mm, draw ratio L/D is 40, engine speed is set as 250 revs/min, each zone temperature (exporting from charge door to head) of main barrel is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, through melt extruding, cooling, pelletize, product is obtained after the operations such as drying and processing.
Embodiment 6
Each component is weighed by embodiment 6 data shown in table 2, by each component mix homogeneously in high-speed mixer beyond inorganic for Compositional type enhancing system, put in the main feeding bin of double screw extruder, inorganic enhancing system puts into side feeding bin, extruder screw diameter is 35mm, draw ratio L/D is 40, engine speed is set as 250 revs/min, each zone temperature (exporting from charge door to head) of main barrel is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, through melt extruding, cooling, pelletize, product is obtained after the operations such as drying and processing.
Embodiment 7
Each component is weighed by embodiment 7 data shown in table 2, by each component mix homogeneously in high-speed mixer beyond inorganic for Compositional type enhancing system, put in the main feeding bin of double screw extruder, inorganic enhancing system puts into side feeding bin, extruder screw diameter is 35mm, draw ratio L/D is 40, engine speed is set as 250 revs/min, each zone temperature (exporting from charge door to head) of main barrel is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, through melt extruding, cooling, pelletize, product is obtained after the operations such as drying and processing.
Embodiment 8
Each component is weighed by embodiment 8 data shown in table 2, by each component mix homogeneously in high-speed mixer beyond inorganic for Compositional type enhancing system, put in the main feeding bin of double screw extruder, inorganic enhancing system puts into side feeding bin, extruder screw diameter is 35mm, draw ratio L/D is 40, engine speed is set as 250 revs/min, each zone temperature (exporting from charge door to head) of main barrel is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, through melt extruding, cooling, pelletize, product is obtained after the operations such as drying and processing.
Table 2 is for the formula table (unit: gram) of the PP composite material of car thin-wall bumper
| Embodiment 5 | Embodiment 6 | Embodiment 7 | Embodiment 8 | |
| PP-1 | 59 | 51 | 55 | 55 |
| PP-2 | 6 | 4 | 5 | 5 |
| The Compositional type compatilizer of embodiment 1 | 15 | |||
| The Compositional type compatilizer of embodiment 2 | 23 | |||
| The Compositional type compatilizer of embodiment 3 | 35 | |||
| The Compositional type compatilizer of embodiment 4 | 23 | |||
| Special toughener-1 | 15 | 6 | 6 | 4 |
| Special toughener-2 | 6 | 2 | 8 | |
| Interface modification auxiliary agent-1 | 5 | 2 | 2 | |
| Interface modification auxiliary agent-2 | 10 | 3 | 3 |
Comparative example 1
Weigh 65 grams of PP-1,10 grams of special toughener-1,23 grams of common Pulvis Talci, 2 grams of interface modification auxiliary agents-1, by each component mix homogeneously in high-speed mixer, put in the main feeding bin of double screw extruder, extruder screw diameter is 35mm, draw ratio L/D is 40, engine speed is set as 250 revs/min, each zone temperature of main barrel (exports from charge door to head) and is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, through melt extruding, cooling down, pelletize, obtains product after the operation such as drying and processing.
Comparative example 2
Commercially available bumper modified polypropylene composite material (trade mark: PEM6I-01 is provided by middle Guang Hejuner company), as a comparison case 2.
Table 3 is for the performance test results of the PP composite material of car thin-wall bumper
Performance test from each embodiment shown in table 3 and comparative example, adopt the inorganic enhancing system of heretofore described Compositional type, more conventional Talc, have in the rigidity of material after this property and be obviously improved effect, its bending modulus is promoted in the interval range of 3100～3300MPa from 1500～1600MPa, and this is the prerequisite that material copes with the lightweight bumper of 2.0mm ultrathin design；Furthermore, in common designations (comparative example 1,2), melting means is only about 15, its material flowability is limited; the mould molding pressure of thin-walled property design is very big; requiring that material possesses good mobile performance, and the material MFR in each embodiment is held in about 30g/10min, the highest (embodiment 8) can arrive 36g/10min; be fully able to the briquetting pressure demand meeting ultra-thin product, shortens the machine-shaping cycle.Although being obviously improved it is noted that bending property, mobile performance have had, but the shock resistance of material does not substantially reduce, and is held in 30～35kJ/m2Between, it is sufficient to every finished parts test of reply bumper so that it is possess good performance.The good conservation rate of impact property, except the toughening effect of special toughener, interface modification increase-volume, eliminate intermolecular cohesion, auxiliary enhancing system well distributed be also very important factor.
In general; the property indices of the thin-walled property bumper that the present invention describes can meet each famous brand main engine plants material standard about thin-walled property bumper; some performance indications such as bending modulus of material is more in advanced level of the same trade both at home and abroad; show each component collocation of material prescription rationally, machined parameters and mode be chosen to work as; the design concept of the advanced car industry of reply current Ge great main engine plants " lightweight, environmental protection " that can be fabulous, thus creating good social benefit and market value.
The ultimate principle of the present invention, principal character and advantages of the present invention have more than been shown and described.Skilled person will appreciate that of the industry; the present invention is not restricted to the described embodiments; described in above-described embodiment and description is that principles of the invention is described; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements both fall within the claimed scope of the invention.Claimed scope is defined by appending claims and equivalent thereof.
Claims (7)
1. the PP composite material for car thin-wall bumper, it is characterised in that include the raw material of following weight portion:
The inorganic enhancing system of described Compositional type is made up of inorganic mineral fiber and the Pulvis Talci that number is 5000～10000 orders；Wherein, inorganic mineral fiber 7～20 weight portion, Pulvis Talci 8～15 weight portion.
2. a kind of PP composite material for car thin-wall bumper according to claim 1, it is characterised in that: described polypropylene is COPP, 230 DEG C, under the test condition of 2.16Kg, its melt index is 30～120g/10min.
3. a kind of PP composite material for car thin-wall bumper according to claim 1, it is characterized in that: one or more in basalt fibre, silicon carbide fibre, calcium sulfate crystal whiskers, alumina whisker of described inorganic mineral fiber, fibre diameter is 1～10um, and draw ratio is 1:50～1:500.
4. a kind of PP composite material for car thin-wall bumper according to claim 1, it is characterised in that: in described Pulvis Talci, dioxide-containing silica >=60wt%, content of magnesia >=30wt%.
5. a kind of PP composite material for car thin-wall bumper according to claim 1, it is characterised in that: described toughener selected from polyolefin elastomer, SBS, SEBS one or more；190 DEG C, under the test condition of 2.16Kg, melt index is 0.5～10g/min.
6. a kind of PP composite material for car thin-wall bumper according to claim 1, it is characterised in that: described interface modification auxiliary agent in maleic anhydride inoculated polypropylene, the nano-synergistic master batch M2007 one or both；Wherein, the percent grafting of maleic anhydride inoculated polypropylene is 0.5%～2%, and the solids content of nano-synergistic master batch M2007 is 10wt%～20wt%.
7. the preparation method of a kind of PP composite material for car thin-wall bumper according to any one of claim 1-6, comprises the following steps:
(1) first weigh polypropylene, toughener and interface modification auxiliary agent, mix homogeneously by following weight portion, obtain mixed material, then weigh the inorganic enhancing system of Compositional type again；
The inorganic enhancing system of described Compositional type is made up of inorganic mineral fiber and the Pulvis Talci that number is 5000～10000 orders；Wherein, inorganic mineral fiber 7～20 weight portion, Pulvis Talci 8～15 weight portion；
(2) by dried for above-mentioned mixed material, it is placed in the main feeding bin of meshing co rotating twin screw extrusion, join in the machine barrel of extruder through feed screw, inorganic for Compositional type enhancing system is joined extruder from side spout, extruder screw diameter is 35mm, draw ratio L/D is 40, each zone temperature that main barrel exports from charge door to head is set as: 60 DEG C, 160 DEG C, 190 DEG C, 195 DEG C, 200 DEG C, 210 DEG C, 210 DEG C, engine speed is 250 revs/min, through melt extruding, cooling down, pelletize, drying and processing, prepare PP composite material.
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| CN108929463A (en) * | 2017-05-24 | 2018-12-04 | 江苏创曦复合材料科技有限公司 | A kind of high-performance composite materials and preparation method thereof |
| CN107603025A (en) * | 2017-10-31 | 2018-01-19 | 苏州润佳工程塑料股份有限公司 | A kind of thin-walled injection moulding PP composite material and preparation method thereof |
| CN109486026A (en) * | 2018-10-29 | 2019-03-19 | 江苏金发科技新材料有限公司 | Improve the polypropene composition and preparation method thereof of surface flame treatment effect |
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| CN111087740A (en) * | 2019-12-19 | 2020-05-01 | 重庆普利特新材料有限公司 | Mineral fiber reinforced low-density high-rigidity polypropylene composite material and preparation method thereof |
| CN114350072A (en) * | 2021-12-23 | 2022-04-15 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
| CN114350072B (en) * | 2021-12-23 | 2023-11-14 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
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