CN115895123A - Polypropylene composition and preparation method and application thereof - Google Patents
Polypropylene composition and preparation method and application thereof Download PDFInfo
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- CN115895123A CN115895123A CN202211516285.5A CN202211516285A CN115895123A CN 115895123 A CN115895123 A CN 115895123A CN 202211516285 A CN202211516285 A CN 202211516285A CN 115895123 A CN115895123 A CN 115895123A
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- -1 Polypropylene Polymers 0.000 title claims abstract description 74
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 73
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 73
- 239000000203 mixture Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims description 8
- 229920001911 maleic anhydride grafted polypropylene Polymers 0.000 claims abstract description 35
- 229920001971 elastomer Polymers 0.000 claims abstract description 20
- 238000012661 block copolymerization Methods 0.000 claims abstract description 11
- 229920005604 random copolymer Polymers 0.000 claims abstract description 9
- 229920001400 block copolymer Polymers 0.000 claims abstract description 8
- 229920005989 resin Polymers 0.000 claims abstract description 4
- 239000011347 resin Substances 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims description 10
- 229920005676 ethylene-propylene block copolymer Polymers 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000012752 auxiliary agent Substances 0.000 claims description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000002087 whitening effect Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 6
- 230000008033 biological extinction Effects 0.000 abstract description 3
- 238000007334 copolymerization reaction Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 15
- 239000000047 product Substances 0.000 description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 229920005629 polypropylene homopolymer Polymers 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 1
- 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 1
- 229920011250 Polypropylene Block Copolymer Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 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 1
- 230000009286 beneficial effect Effects 0.000 description 1
- XQYBHCMKXLINQE-UHFFFAOYSA-N buta-1,3-diene;prop-1-ene Chemical compound CC=C.C=CC=C XQYBHCMKXLINQE-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002978 peroxides Chemical class 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
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The polypropylene composition comprises the following components in parts by weight: 70-90 parts of random copolymer polypropylene; 10-30 parts of block copolymer polypropylene; 3-8 parts of maleic anhydride grafted polypropylene; the grafting rate of the maleic anhydride grafted polypropylene is 0.5-1.5wt%. According to the invention, a high-impact polypropylene composition can be obtained by adding a specific amount of block copolymerization polypropylene into a random copolymerization polypropylene resin matrix, and the extinction effect can be achieved and the stress whitening phenomenon caused by a rubber phase in the block copolymerization polypropylene can be obviously improved by adding maleic anhydride grafted polypropylene.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a polypropylene composition and a preparation method and application thereof.
Background
The polypropylene has the advantages of low price, easy processing and forming, low density, chemical corrosion resistance, excellent physical and mechanical properties and the like, and is widely applied to home at present. However, as aesthetic requirements of people on the appearance of household products are higher and higher, if the surface of a product is required to have low gloss, the product is affected by external force to cause low stress whitening, and the product has good impact resistance.
In the prior art, the homopolymerized polypropylene does not contain a rubber phase, so that the toughness of the composition of a using system is low; the block copolymerization polypropylene belongs to heterogeneous polymers, and the rubber phase of the block copolymerization polypropylene is used as a disperse phase, so that the block copolymerization polypropylene has higher toughness, but the stress whitening phenomenon is more likely to occur compared with homopolymerization polypropylene.
Chinese patent CN101173075A achieves a low gloss effect by adding silicon dioxide, but also worsens the stress whitening of the system due to the addition of inorganic fillers and elastomers.
Therefore, there is a need in the household field to develop a polypropylene composition having both low gloss and low stress whitening, and having good impact resistance.
Disclosure of Invention
The invention aims to provide a polypropylene composition with low gloss, low stress whitening and good impact resistance, and a preparation method and application thereof.
The invention is realized by the following technical scheme:
the polypropylene composition comprises the following components in parts by weight:
70-90 parts of random copolymer polypropylene;
10-30 parts of block copolymer polypropylene;
3-8 parts of maleic anhydride grafted polypropylene;
the grafting rate of the maleic anhydride grafted polypropylene is 0.5-1.5wt%.
Preferably, the composition comprises the following components in parts by weight:
75-85 parts of random copolymer polypropylene;
15-25 parts of block copolymer polypropylene;
5-7 parts of maleic anhydride grafted polypropylene. Within the preferable range, the gloss, stress whitening and impact resistance are more balanced.
The melt index of the random copolymerization polypropylene resin under the condition of 230 ℃/2.16kg is 8-32g/10min.
The block copolymerization polypropylene is at least one of ethylene propylene block copolymerization polypropylene and propylene butadiene block copolymerization polypropylene, wherein the average grain diameter of a rubber phase is 0.1-5 microns, preferably, the average grain diameter of the rubber phase is 0.1-2 microns (the test method comprises the steps of taking a cantilever beam notch impact strength sample strip, freezing and brittle failure in liquid nitrogen, etching for 24 hours at normal temperature by dimethylbenzene, washing by distilled water, drying at 80 ℃, carrying out gold spraying treatment, observing the section by a scanning electron microscope, measuring the diameter of the etched hole, and calculating the average number value, namely the grain diameter of the rubber phase). The rubber phase particle size has relevance with the extinction/stress whitening phenomenon, the low stress whitening effect can be realized when the average rubber phase particle size is smaller than 5 micrometers, the stress whitening resistance is better when the average rubber phase particle size is smaller, but the cantilever beam notch impact strength is lower when the average rubber phase particle size is smaller.
Preferably, the grafting ratio of the maleic anhydride grafted polypropylene is 0.8-1.1wt%. The maleic anhydride grafted polypropylene can be a commercial product or a self-made raw material, and the self-made method comprises the following steps: according to the proportion, polypropylene, maleic anhydride and peroxide such as dicumyl peroxide are extruded by a double-screw extruder, the temperature range of the screw is 165-200 ℃, and the maleic anhydride grafted polypropylene is obtained.
The maleic anhydride grafted polypropylene is used as an auxiliary agent and has a lower content in the composition, so that the technical scheme of the invention has no special requirements on other parameters of the maleic anhydride grafted polypropylene, and experiments show that the technical effect of the invention can be realized when the melt index of the maleic anhydride grafted polypropylene is within the range of 5-25g/10min (230 ℃/0.325 kg).
Whether 0-2 parts of auxiliary agent is added or not can be selected according to actual requirements, and the auxiliary agent is selected from at least one of antioxidant and lubricant. The antioxidant can be IRGANOX 1010 and IRGAFOS 168. The lubricant may be ethylene bis stearamide.
The preparation method of the polypropylene composition comprises the following steps: according to the proportion, the components are uniformly mixed and extruded and granulated by a double-screw extruder, wherein the temperature range of a screw is 200-230 ℃, and the rotating speed range is 300-400 r/min, so that the polypropylene composition is obtained.
The polypropylene composition is used for preparing household products such as child seat shells, and simultaneously achieves the stress whitening resistance of less than or equal to 3.3mm and the notched izod impact strength of more than or equal to 5.0 kJ/m 2 And the glossiness is less than 60.
The invention has the following beneficial effects:
according to the invention, the high-impact-resistance polypropylene composition can be obtained by adding a specific amount of block copolymerization polypropylene into a random copolymerization polypropylene resin matrix, and the extinction effect can be achieved by adding maleic anhydride grafted polypropylene, and the stress whitening phenomenon caused by a rubber phase in the block copolymerization polypropylene is obviously improved.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the invention.
The examples and comparative examples used the following sources of raw materials:
random copolymer polypropylene A: J-570S, letian, korea, melt index 28g/10min, test conditions 230 ℃, 2.16kg.
Random copolymer polypropylene B: UT8012M, mafendization, melt index 12g/10min, test condition 230 ℃, 2.16kg.
Ethylene-propylene block copolymer polypropylene A: the rubber particle size is 1 micron, and the rubber is named as petrochemical PPB-MT25-S;
ethylene-propylene block copolymer polypropylene B: the rubber particle size is 2 microns, and the rubber is named as petrochemical PPB-MT08-S;
ethylene-propylene block copolymer polypropylene C: the particle size of the rubber is 5 microns, and the Lanzhou petrochemical SP179 is adopted;
propylene-butadiene block copolymer polypropylene: the rubber particle size is 1.5 microns, and the metallocene petrochemical PPD-MT45-S;
homo-polypropylene: HP500N, mediterranean shell, melt index 12g/10min, test conditions 230 ℃, 2.16kg.
Maleic anhydride-grafted polypropylene a: the maleic anhydride grafting rate is 0.5wt%, the melt index is 9.4g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
Maleic anhydride-grafted polypropylene B: the maleic anhydride grafting rate is 0.8wt%, the melt index is 13.4g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
Maleic anhydride-grafted polypropylene C: the maleic anhydride grafting rate is 1.1wt%, the melt index is 16.3g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
Maleic anhydride-grafted polypropylene D: the maleic anhydride grafting rate is 1.5wt%, the melt index is 22.4g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
Maleic anhydride grafted polypropylene E: the maleic anhydride grafting rate is 0.2wt%, the melt index is 5.3g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
Maleic anhydride-grafted polypropylene F: the maleic anhydride grafting rate is 1.9wt%, the melt index is 26.7g/10min (230 ℃/0.325 kg), and the self-made product is prepared.
In the specific embodiment of the invention, homo-polypropylene with the same grade and maleic anhydride are adopted for grafting reaction.
Lubricant: ethylene bis stearamide (abbreviated EBS), commercially available.
Examples and comparative examples preparation of polypropylene compositions: according to the proportion, the components are uniformly mixed and extruded and granulated by a double-screw extruder, wherein the temperature range of the screw is 200-230 ℃, and the rotating speed range is 330 revolutions per minute, so as to obtain the polypropylene composition.
The test methods are as follows:
(1) Glossiness: according to the GB/T8807-1988 standard, 60 degrees angle, with dimensionless units.
(2) Stress whitening resistance: the composition was prepared as a 100 x 3mm square plate at ambient temperature of about 23 ℃, subjected to a drop test from a 300mm height using a steel ball weighing 500g and having a diameter of 50mm, and the diameter of the whitish zone was recorded (average of 10 samples per material to be tested).
(3) Izod notched impact strength: according to the test of ISO 180-2019 standard, the type of the cantilever beam notch is A type notch, and the unit is kJ/m 2 。
Table 1: EXAMPLES 1-7 Polypropylene compositions the contents of the respective Components (parts by weight) and the test results
| Example 1 | Example 2 | Example 3 | Example 4 | Practice ofExample 5 | Example 6 | |
| Random copolymerized Polypropylene A | 70 | 75 | 80 | 85 | 90 | |
| Random copolymerized polypropylene B | 80 | |||||
| Ethylene propylene block copolymer polypropylene A | 30 | 25 | 20 | 15 | 10 | 20 |
| Maleic anhydride grafted Polypropylene A | 3 | 5 | 6 | 7 | 8 | 6 |
| Lubricant agent | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| Notched Izod impact Strength, kJ/m 2 | 8.2 | 7.7 | 7.1 | 6.4 | 5.2 | 7.4 |
| Degree of gloss | 58 | 54 | 53 | 52 | 46 | 55 |
| Stress whitening resistance, mm | 2.3 | 2.5 | 2.6 | 2.7 | 2.8 | 2.7 |
From examples 1 to 5, it is clear that the preferred compounding ratioWithin the range of less than 55 and a notched Izod impact strength of greater than 6 kJ/m 2 The stress whitening resistance is less than or equal to 2.7.
Table 2: examples 7-12 Polypropylene compositions content of Components (parts by weight) and test results
| Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | |
| Random copolymerized Polypropylene A | 80 | 80 | 80 | 80 | 80 | 80 |
| Ethylene propylene block copolymer polypropylene A | 20 | 20 | 20 | |||
| Ethylene-propylene block copolymer polypropylene B | 20 | |||||
| Ethylene propylene block copolymer polypropylene C | 20 | |||||
| Polypropylene block copolymer | 20 | |||||
| Maleic anhydride grafted Polypropylene A | 6 | 6 | 6 | |||
| Maleic anhydride grafted Polypropylene B | 6 | |||||
| Maleic anhydride grafted Polypropylene C | 6 | |||||
| Maleic anhydride grafted Polypropylene D | 6 | |||||
| Lubricant agent | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Notched Izod impact Strength, kJ/m 2 | 8.8 | 10.5 | 6.5 | 7.5 | 7.2 | 6.8 |
| Degree of gloss | 49 | 45 | 55 | 50 | 49 | 46 |
| Stress whitening resistance, mm | 2.9 | 3.3 | 2.3 | 2.4 | 2.5 | 3.1 |
From example 3/7/8, it is understood that the stress whitening resistance is best when the average particle diameter of the block copolymer polypropylene rubber phase is 0.1 to 2 μm.
As can be seen from examples 3/10-12, it is preferable that the maleic anhydride-grafted polypropylene has a grafting ratio of 0.8 to 1.1wt%, a higher Izod notched impact strength, and a lower level of gloss and stress whitening resistance, and a better balance of properties.
Table 3: comparative example Polypropylene composition the contents of the respective Components (parts by weight) and the test results
| Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 | Comparative example 8 | |
| Random copolymer Polypropylene A | 80 | 80 | 65 | 95 | 80 | 80 | 80 | |
| Homo-polypropylene | 80 | |||||||
| Ethylene propylene block copolymer polypropylene A | 20 | 20 | 35 | 5 | 20 | 20 | 20 | 20 |
| Maleic anhydride grafted Polypropylene A | 6 | 6 | 6 | 1 | 10 | |||
| Maleic anhydride grafted Polypropylene E | 6 | |||||||
| Maleic anhydride grafted Polypropylene F | 6 | |||||||
| Lubricant agent | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Notched Izod impact Strength, kJ/m 2 | 6.9 | 4.5 | 8.5 | 4.5 | 3.4 | 5.3 | 3.3 | 7.5 |
| Degree of gloss | 73 | 45 | 69 | 74 | 69 | 46 | 44 | 83 |
| Stress whitening resistance, mm | 2.9 | 4.8 | 3.4 | 2.5 | 3.6 | 4.9 | 6.6 | 3.3 |
As can be seen from comparative examples 1/2, if the graft ratio of the maleic anhydride-grafted polypropylene is too low, the stress whitening resistance is low, but the gloss is shown to be too high; for example, maleic anhydride-grafted polypropylene has too high graft ratio, poor impact resistance and poor stress whitening resistance.
From comparative examples 3/4/6/7, it is understood that the technical effects of the present invention cannot be obtained if the component ratios are out of the range of the present invention.
As can be seen from comparative example 8, the gloss was too high without adding maleic anhydride-grafted polypropylene.
As can be seen from comparative example 5, the homo-polypropylene could not achieve the technical effects of the present invention.
Claims (8)
1. The polypropylene composition is characterized by comprising the following components in parts by weight:
70-90 parts of random copolymer polypropylene;
10-30 parts of block copolymerization polypropylene;
3-8 parts of maleic anhydride grafted polypropylene;
the grafting rate of the maleic anhydride grafted polypropylene is 0.5-1.5wt%.
2. The polypropylene composition according to claim 1, comprising the following components in parts by weight:
75-85 parts of random copolymer polypropylene;
15-25 parts of block copolymer polypropylene;
5-7 parts of maleic anhydride grafted polypropylene.
3. The polypropylene composition according to claim 1, wherein the melt index of the random copolymer polypropylene resin is 8-32g/10min at 230 ℃/2.16 kg.
4. The polypropylene composition according to claim 1, wherein the block copolymer polypropylene is at least one selected from the group consisting of ethylene-propylene block copolymer polypropylene and propylene-butylene block copolymer polypropylene, and wherein the rubber phase has an average particle size of 0.1 to 5 microns, preferably 0.1 to 2 microns.
5. The polypropylene composition of claim 1, wherein the maleic anhydride grafted polypropylene has a graft ratio of 0.8 to 1.1wt%.
6. The polypropylene composition according to claim 1, further comprising 0-2 parts by weight of an auxiliary agent, wherein the auxiliary agent is at least one selected from an antioxidant and a lubricant.
7. Process for the preparation of a polypropylene composition according to any one of claims 1 to 6, comprising the steps of: according to the proportion, the components are uniformly mixed and extruded and granulated by a double-screw extruder, wherein the temperature range of a screw is 200-230 ℃, and the rotating speed range is 300-400 r/min, so that the polypropylene composition is obtained.
8. Use of a polypropylene composition according to any one of claims 1 to 6 for the preparation of household products, such as a shell for a child seat.
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| CN114507399A (en) * | 2022-03-24 | 2022-05-17 | 成都金发科技新材料有限公司 | Polypropylene material and preparation method and application thereof |
| CN115322491A (en) * | 2022-08-26 | 2022-11-11 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
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| CN114507399A (en) * | 2022-03-24 | 2022-05-17 | 成都金发科技新材料有限公司 | Polypropylene material and preparation method and application thereof |
| CN115322491A (en) * | 2022-08-26 | 2022-11-11 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
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| CN115703908A (en) * | 2021-08-17 | 2023-02-17 | 中国石油天然气股份有限公司 | Polypropylene composition and preparation method and application thereof |
| CN115703908B (en) * | 2021-08-17 | 2023-12-22 | 中国石油天然气股份有限公司 | Polypropylene composition and preparation method and application thereof |
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