CN114507396A - Polypropylene composition, preparation method and application - Google Patents
Polypropylene composition, preparation method and application Download PDFInfo
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- CN114507396A CN114507396A CN202210212514.8A CN202210212514A CN114507396A CN 114507396 A CN114507396 A CN 114507396A CN 202210212514 A CN202210212514 A CN 202210212514A CN 114507396 A CN114507396 A CN 114507396A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 136
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 136
- -1 Polypropylene Polymers 0.000 title claims abstract description 130
- 239000000203 mixture Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000003351 stiffener Substances 0.000 claims abstract description 57
- 238000009826 distribution Methods 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000011347 resin Substances 0.000 claims abstract description 16
- 239000012745 toughening agent Substances 0.000 claims abstract description 13
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 229920003023 plastic Polymers 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims description 16
- 239000004611 light stabiliser Substances 0.000 claims description 13
- 239000003963 antioxidant agent Substances 0.000 claims description 12
- 230000003078 antioxidant effect Effects 0.000 claims description 12
- 229920001577 copolymer Polymers 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 229920005633 polypropylene homopolymer resin Polymers 0.000 claims description 3
- 229920006249 styrenic copolymer Polymers 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 150000001412 amines Chemical class 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 238000004898 kneading Methods 0.000 claims 1
- 238000005453 pelletization Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 40
- 239000000945 filler Substances 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 3
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- SSADPHQCUURWSW-UHFFFAOYSA-N 3,9-bis(2,6-ditert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound CC(C)(C)C1=CC(C)=CC(C(C)(C)C)=C1OP1OCC2(COP(OC=3C(=CC(C)=CC=3C(C)(C)C)C(C)(C)C)OC2)CO1 SSADPHQCUURWSW-UHFFFAOYSA-N 0.000 description 1
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 238000005227 gel permeation chromatography Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polypropylene composition, a preparation method and application thereof. The polypropylene composition comprises the following components in parts by weight: 40-90 parts of polypropylene resin, 10-30 parts of toughening agent, 10-30 parts of stiffening agent and 0.2-0.8 part of processing aid; the stiffening agent is polypropylene with molecular weight distribution index of 5-20 and weight average molecular weight of more than 500000 daltons. The invention adds the stiffening agent with the molecular weight distribution index of 5-20 into the polypropylene material, provides the strength and rigidity for the material through the high molecular weight part of the stiffening agent, provides the toughness, the fluidity and the processability of the material through the low molecular weight part, and simultaneously can avoid the defects that the rigidity of the material is increased and the density of the material is increased by adding the filler in the traditional method. The polypropylene composition has the characteristics of high modulus, high impact and light weight, and can be used for preparing automobile plastic parts.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene composition, and a preparation method and application thereof.
Background
Polypropylene (PP) has the advantages of low density, easy processing, excellent mechanical properties, etc., and has been widely used in the fields of automobile industry, home appliances and machinery. For the automotive industry, polypropylene is mainly used for interior and exterior parts of automobiles, such as instrument panels, door panels, pillars and the like, and exterior parts such as bumpers, fenders, deflectors and the like. The light weight of the automobile is an important direction for the development of the automobile, and the main ways for realizing the light weight of the automobile material are low density, thin wall and micro-foaming. For thinning, the rigidity of the part is reduced after the part is thinned, and the material is required to have higher modulus in order to keep the original rigidity of the part.
Many studies have been made to increase the modulus of polypropylene materials. Filler filling is the most common method used in polypropylene. CN201110430772.5 wollastonite whiskers are added into a polypropylene material to improve the rigidity of the material. CN201910245653.9 is reinforced by adding glass fiber in addition to mineral filling in PP. These solutions increase the rigidity of the material by adding minerals, but result in an increase in the density of the material, which is not conducive to weight reduction. Therefore, there is still a need in the art to develop a polypropylene material with simple preparation method and high performance for use in plastic parts of automobiles.
Disclosure of Invention
The invention aims to provide a polypropylene composition, a preparation method and application aiming at the defects of the prior art. The polypropylene composition is added with the polypropylene with the molecular weight distribution index of 5-20 as a stiffening agent, so that the polypropylene composition material realizes light weight while strengthening, stiffening and toughening.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the polypropylene composition comprises the following components in parts by weight: 40-90 parts of polypropylene resin, 10-30 parts of toughening agent, 10-30 parts of stiffening agent and 0.2-0.8 part of processing aid; the stiffening agent is polypropylene with molecular weight distribution index of 5-20 and weight average molecular weight of more than 500000 daltons.
The weight average molecular weight of the invention is more than 500000 daltons and is called high molecular weight; the weight average molecular weight of less than 500000 daltons is called low molecular weight, and the total content of the low molecular weight polypropylene and the high molecular weight polypropylene in the stiffening agent is 100%.
Compared with the traditional polypropylene (the molecular weight distribution index of the traditional polypropylene is 3-4), the high molecular weight part of the stiffening agent provides strength and rigidity for the material, and the low molecular weight part provides toughness, fluidity and processability of the material, so that the defect that the filler is added for increasing the rigidity of the material in the traditional method and the density of the material is increased at the same time can be avoided. In addition, through a large number of experiments, the inventor finds that when the content of the stiffening agent is lower, the rigidity of the material is not obviously improved, but when the content of the stiffening agent is higher, the toughness of the material is obviously reduced, so that the adding amount of the stiffening agent is within the range defined by the invention, and the obtained polypropylene composition has the characteristics of high modulus, high impact and low density.
As a preferred embodiment of the invention, the content of polypropylene with the weight-average molecular weight of more than 500000 daltons in the stiffening agent accounts for 30% -40%.
According to the invention, the comprehensive performance of the prepared material is stronger by optimizing the content of high molecular weight polypropylene in the stiffening agent, and the material has the performances of high modulus, high impact and low density.
As a preferred embodiment of the invention, the stiffening agent is polypropylene having a molecular weight distribution index of 10 to 16; more preferably, the stiffening agent is polypropylene having a molecular weight distribution index of 13.
The molecular weight distribution index of the polypropylene is measured according to gel permeation chromatography, and generally, the molecular weight distribution index D ═ Mw/Mn represents the width of the molecular weight distribution, where Mw represents the weight average molecular weight and Mn represents the number average molecular weight; the molecular weight distribution index of the stiffening agent directly influences the rigidity and toughness of the material, the flexural modulus is increased and the impact strength is reduced along with the increase of the molecular weight distribution index of the stiffening agent, the material has better rigidity and toughness within the molecular weight distribution index range of the stiffening agent defined by the invention, and when the molecular weight distribution index of the stiffening agent is 13, the polypropylene composition has the characteristics of high modulus, high impact and low density, and the material performance is optimal.
As a preferred embodiment of the invention, the stiffening agent is 15-25 parts by weight; more preferably, the stiffening agent is 20 parts by weight.
Through a large number of experiments, the inventor finds that the rigidity-increasing agent accounts for 15-25 parts by weight, the prepared polypropylene composition has better modulus and impact property and lower density, and when the rigidity-increasing agent accounts for 20 parts by weight, the comprehensive performance of the material is optimal.
As a preferred embodiment of the present invention, the polypropylene resin is at least one of a homo-polypropylene resin and a co-polypropylene resin; the molecular weight distribution index of the polypropylene resin is 3-4.
As a preferred embodiment of the present invention, the toughening agent is at least one of ethylene-butene copolymer, ethylene-octene copolymer, styrene copolymer elastomer.
As a preferred embodiment of the present invention, the processing aid includes an antioxidant, a light stabilizer.
As a preferred embodiment of the present invention, the antioxidant is 0.1 to 0.5 parts by weight, and the light stabilizer is 0.1 to 0.3 parts by weight.
As a preferred embodiment of the invention, the antioxidant is at least one of hindered phenol antioxidant and phosphite antioxidant; more preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 3114, antioxidant 168 and antioxidant PEP-36.
As a preferred embodiment of the present invention, the light stabilizer is a hindered amine-based light stabilizer; more preferably, the light stabilizer is at least one of a light stabilizer UV-3808PP5, a light stabilizer LA-402XP and a light stabilizer LA-402 AF.
In addition, the invention also claims a preparation method of the polypropylene composition, which comprises the following steps:
and uniformly mixing the polypropylene resin, the toughening agent, the stiffening agent and the processing aid, and then carrying out melt mixing, extrusion and granulation to obtain the polypropylene composition.
As a preferred embodiment of the invention, the device for melting, mixing, extruding and granulating is a double-screw extruder, and the rotating speed of the double-screw extruder is 350-450 r/min; the melting and mixing temperature is 170-220 ℃.
The polypropylene composition disclosed by the invention is applied to preparation of automobile plastic parts.
The polypropylene composition has the characteristics of high modulus, high impact and light weight, and is suitable for the development direction of light weight of automobiles, so that the polypropylene composition can be used for preparing plastic parts of automobiles.
Compared with the prior art, the invention has the beneficial effects that:
the polypropylene material is added with the polypropylene with the molecular weight distribution index of 5-20 as the stiffening agent, the high molecular weight part of the stiffening agent provides strength and rigidity for the material, the low molecular weight part provides toughness, fluidity and processability of the material, and the defect that the rigidity of the material is increased and the density of the material is increased due to the addition of the filler in the traditional method can be avoided. Therefore, the polypropylene composition can be used for preparing plastic parts of automobiles.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
The following test examples are illustrated by taking the following raw materials as examples, and other raw materials can be used in actual production, and the raw materials are as follows:
polypropylene resin a: homo-polypropylene resin, specific trade mark: PP H9018, supplied by landlocked;
polypropylene resin B: copolymerized polypropylene resin, specific trade mark: PP EP548R, supplied by zhonghai shell brand;
a toughening agent A: ethylene-butene copolymer, commercially available, the same ethylene-butene copolymer was used in parallel experiments;
a toughening agent B: ethylene-octene copolymers, commercially available, were used in parallel experiments with the same ethylene-octene copolymer;
a toughening agent C: styrenic copolymer, commercially available, the same styrenic copolymer was used in parallel experiments;
the preparation method of the stiffening agent comprises the following steps:
(1) adding a propylene monomer and a catalyst into a normal hexane solution for reaction;
(2) and introducing hydrogen to stop the reaction to control the reaction time, thereby obtaining the polypropylene with different weight average molecular weights and molecular weight distribution indexes.
The invention controls hydrogen to stop reaction, and regulates and controls the high molecular weight content and the molecular weight distribution index in the stiffening agent by regulating the reaction time.
The adjustment of the high molecular weight content and the molecular weight distribution index of the polymer by hydrogen termination reaction is conventional in the art and will not be described further herein; during application, the time for terminating the reaction by the hydrogen can be adjusted according to different actual requirements so as to obtain polypropylene with different high molecular weight contents and different molecular weight distribution indexes.
A stiffening agent A: polypropylene, wherein the molecular weight distribution index is 2, the content of the high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent B: polypropylene, the molecular weight distribution index is 5, the content of the high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent C: polypropylene with a molecular weight distribution index of 10, the content of high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-made;
a stiffening agent D: polypropylene, wherein the molecular weight distribution index is 13, the content of the high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent E: polypropylene with a molecular weight distribution index of 16, the content of high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent F: polypropylene, the molecular weight distribution index is 20, the content of the high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent G: polypropylene, wherein the molecular weight distribution index is 25, the content of the high molecular weight polypropylene accounts for 35 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
and (3) a stiffening agent H: polypropylene with a molecular weight distribution index of 10, the content of high molecular weight polypropylene accounts for 30 percent, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent I: polypropylene with a molecular weight distribution index of 10, the content of high molecular weight polypropylene accounts for 40%, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
stiffening agent J: polypropylene with a molecular weight distribution index of 10, the content of high molecular weight polypropylene accounts for 20%, and the weight average molecular weight of the high molecular weight polypropylene is more than 500000 daltons; self-making;
a stiffening agent K: polypropylene with molecular weight distribution index of 10, high molecular weight polypropylene content of 60%, and high molecular weight polypropylene weight average molecular weight of over 500000 Dalton; self-making;
a stiffening agent L: polypropylene with a molecular weight distribution index of 10 and a high molecular weight polypropylene content of 100%; self-making;
polypropylene M: polypropylene, wherein the molecular weight distribution index is 10, and the content of the high molecular weight polypropylene accounts for 0 percent; self-making;
antioxidant 1010, commercially available, the same antioxidant 1010 was used for all examples and comparative examples;
antioxidant 168, commercially available, the same antioxidant 168 was used for all examples and comparative examples;
light stabilizer 3808PP5, commercially available, all examples and comparative examples used the same light stabilizer 3808PP 5;
filling: talc, commercially available, the same talc was used for all examples and comparative examples.
Examples
The polypropylene composition of examples 1 to 17 of the present invention has the composition shown in table 1.
The preparation method of the polypropylene composition in the embodiments 1-17 of the invention comprises the following steps:
uniformly mixing polypropylene resin, a toughening agent, a stiffening agent and a processing aid, and then carrying out melt mixing and extrusion granulation on the mixture in a double-screw extruder to obtain a polypropylene composition; the melting and mixing temperature is 170-220 ℃; the rotating speed of the double-screw extruder is 350-450 rpm.
TABLE 1
Comparative example
The polypropylene compositions of comparative examples 1 to 7 of the present invention have the composition components shown in Table 2.
The preparation methods of the polypropylene compositions of comparative examples 2 to 5 and 7 of the present invention are the same as those of examples 1 to 17.
The preparation method of the polypropylene composition of comparative example 1 of the present invention comprises:
uniformly mixing polypropylene resin, a toughening agent and a processing aid, and then carrying out melt mixing and extrusion granulation on the mixture in a double-screw extruder to obtain a polypropylene composition; the melting and mixing temperature is 170-220 ℃; the rotating speed of the double-screw extruder is 350-450 revolutions per minute.
The preparation method of the polypropylene composition of comparative example 6 of the present invention comprises:
uniformly mixing polypropylene resin, a toughening agent, a filler and a processing aid, and then carrying out melt mixing and extrusion granulation on the mixture in a double-screw extruder to obtain a polypropylene composition; the melting and mixing temperature is 170-220 ℃; the rotating speed of the double-screw extruder is 350-450 rpm.
TABLE 2
Examples of effects
And (3) performance testing:
the products of the examples and comparative examples were tested according to the following criteria, and the relevant test methods and criteria are as follows:
1. flexural modulus: the flexural modulus of the material was tested using ISO178-2001, test for flexural Strength of plastics.
2. Notched izod impact strength: the notched impact strength of the materials was tested using ISO180-2006 "determination of Izod impact strength of plastics".
3. Density: the density of the material was tested using ISO1183-2012 "determination of plastic density".
The performance test results of the polypropylene compositions of examples 1 to 17 and comparative examples 1 to 7 of the present invention are shown in Table 3.
TABLE 3
Remarking: the flexural modulus of the polypropylene composition is larger than 1450MPa, and the izod notched impact strength is larger than 20.0kJ/m2The material has high modulus, high impact mechanical properties; the density of the polypropylene composition is less than or equal to 0.903, which shows that the material has the characteristic of light weight; the polypropylene composition has a flexural modulus of > 1720MPa and an izod notched impact strength of > 24.0kJ/m2And the density is less than or equal to 0.903, which indicates that the comprehensive performance of the material is better; the flexural modulus of the polypropylene composition is more than 2000MPa, and the notched Izod impact strength is more than 25.0kJ/m2And the density is less than or equal to 0.903.
From the data in Table 3, it can be seen that the polypropylene compositions of examples 1 to 17 according to the present invention have high modulus, high impact and light weight compared to comparative examples 1 to 6. According to the data of examples 1-5 and comparative examples 2-3, it is found that the flexural modulus of the polypropylene composition increases with the addition amount of the stiffening agent, but the izod notched impact strength decreases, but when the addition amount of the stiffening agent is within the range defined by the invention, the polypropylene composition has the characteristics of high modulus, high impact and light weight.
Based on the data of examples 1-5 and comparative example 1, it was found that the flexural modulus and notched Izod impact strength of the material are improved most remarkably when the amount of the stiffening agent added is 15-25 parts by weight relative to the material of comparative example 1 without the stiffening agent added, wherein in example 3, when the amount of the stiffening agent added is 20 parts, the flexural modulus of the polypropylene composition is more than 2000MPa, and the notched Izod impact strength is more than 25.0kJ/m2And the density is less than or equal to 0.903, so the polypropylene composition of the example 3 has the best comprehensive performance.
According to examples 3, 6 to 9 and comparative examples 4 to 5, as the molecular weight distribution index of the stiffening agent increases, the flexural modulus of the polypropylene composition increases, but the notched izod impact strength decreases; when the molecular weight distribution index of the stiffening agent is within the range defined by the invention, the polypropylene composition has the characteristics of high modulus, high impact and light weight.
According to the data of examples 6-9 and comparative example 1, the stiffening agent has the most obvious improvement on the flexural modulus and notched Izod impact strength of the material when the molecular weight distribution index of the stiffening agent is 10-16 compared with the material of comparative example 1 without the stiffening agent, wherein the flexural modulus of the polypropylene composition is more than 2000MPa and the notched Izod impact strength is more than 25.0kJ/m when the molecular weight distribution index of the stiffening agent is 13 in example 32And the density is less than or equal to 0.903, so the polypropylene composition of the example 3 has the best comprehensive performance.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The polypropylene composition is characterized by comprising the following components in parts by weight: 40-90 parts of polypropylene resin, 10-30 parts of toughening agent, 10-30 parts of stiffening agent and 0.2-0.8 part of processing aid; the stiffening agent is polypropylene with molecular weight distribution index of 5-20 and weight average molecular weight of more than 500000 daltons.
2. The polypropylene composition of claim 1, wherein the polypropylene having a weight average molecular weight of 500000 daltons is present in the stiffening agent in an amount of 30% to 40%.
3. The polypropylene composition of claim 1, wherein the molecular weight distribution index of the stiffening agent is from 10 to 16.
4. The polypropylene composition of claim 1, wherein the stiffening agent is 15 to 25 parts by weight.
5. The polypropylene composition according to claim 1, wherein the polypropylene resin is at least one of a homo-polypropylene resin and a co-polypropylene resin.
6. The polypropylene composition of claim 1, wherein the toughening agent is at least one of an ethylene-butene copolymer, an ethylene-octene copolymer, and a styrenic copolymer elastomer.
7. The polypropylene composition of claim 1, wherein the processing aid comprises an antioxidant, a light stabilizer; the antioxidant is at least one of hindered phenol antioxidant and phosphite antioxidant; the light stabilizer is a hindered amine light stabilizer.
8. Process for the preparation of a polypropylene composition according to any one of claims 1 to 7, comprising the steps of:
and uniformly mixing the polypropylene resin, the toughening agent, the stiffening agent and the processing aid, and then carrying out melt mixing, extrusion and granulation to obtain the polypropylene composition.
9. The method for preparing the polypropylene composition according to claim 8, wherein the melt-kneading, extruding and pelletizing device is a twin-screw extruder, and the rotating speed of the twin-screw extruder is 350-450 rpm; the melting and mixing temperature is 170-220 ℃.
10. Use of a polypropylene composition according to any one of claims 1 to 7 for the preparation of plastic parts for automobiles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210212514.8A CN114507396A (en) | 2022-03-04 | 2022-03-04 | Polypropylene composition, preparation method and application |
Applications Claiming Priority (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115572438A (en) * | 2022-10-12 | 2023-01-06 | 江阴爱科森博顿聚合体有限公司 | Low-shrinkage high-transparency polypropylene filling rope material and preparation method thereof |
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