CN117430888A - Foaming polypropylene composition and preparation method and application thereof - Google Patents
Foaming polypropylene composition and preparation method and application thereof Download PDFInfo
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- CN117430888A CN117430888A CN202311624094.5A CN202311624094A CN117430888A CN 117430888 A CN117430888 A CN 117430888A CN 202311624094 A CN202311624094 A CN 202311624094A CN 117430888 A CN117430888 A CN 117430888A
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- polypropylene composition
- resin
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- specific surface
- foaming
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 93
- -1 polypropylene Polymers 0.000 title claims abstract description 59
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 53
- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 238000005187 foaming Methods 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000155 melt Substances 0.000 claims abstract description 42
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 239000000945 filler Substances 0.000 claims abstract description 33
- 150000001875 compounds Chemical class 0.000 claims abstract description 18
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 20
- 239000003607 modifier Substances 0.000 claims description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 7
- 239000000600 sorbitol Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 230000003078 antioxidant effect Effects 0.000 claims description 6
- 239000004611 light stabiliser Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 239000012745 toughening agent Substances 0.000 claims description 6
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 239000012752 auxiliary agent Substances 0.000 claims description 4
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 4
- XZIIFPSPUDAGJM-UHFFFAOYSA-N 6-chloro-2-n,2-n-diethylpyrimidine-2,4-diamine Chemical compound CCN(CC)C1=NC(N)=CC(Cl)=N1 XZIIFPSPUDAGJM-UHFFFAOYSA-N 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229940035044 sorbitan monolaurate Drugs 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 239000000741 silica gel Substances 0.000 claims description 2
- 229910002027 silica gel Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims description 2
- 239000000454 talc Substances 0.000 claims description 2
- 229910052623 talc Inorganic materials 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- LPMBTLLQQJBUOO-KTKRTIGZSA-N (z)-n,n-bis(2-hydroxyethyl)octadec-9-enamide Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)N(CCO)CCO LPMBTLLQQJBUOO-KTKRTIGZSA-N 0.000 claims 1
- 235000012239 silicon dioxide Nutrition 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 abstract description 11
- 239000006260 foam Substances 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229920006351 engineering plastic Polymers 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 37
- 230000000694 effects Effects 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 21
- 210000004027 cell Anatomy 0.000 description 18
- 239000004088 foaming agent Substances 0.000 description 17
- 238000012360 testing method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 13
- 239000002245 particle Substances 0.000 description 8
- 229920005862 polyol Polymers 0.000 description 8
- 150000003077 polyols Chemical class 0.000 description 8
- 239000013585 weight reducing agent Substances 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 230000004580 weight loss Effects 0.000 description 5
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- DKBCURTUXYMRFB-LXTVHRRPSA-N (2r,3r,4s,5r)-7-(3,4-dimethylphenyl)hept-6-ene-1,2,3,4,5,6-hexol Chemical compound CC1=CC=C(C=C(O)[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO)C=C1C DKBCURTUXYMRFB-LXTVHRRPSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NTYJJOPFIAHURM-UHFFFAOYSA-N Histamine Chemical compound NCCC1=CN=CN1 NTYJJOPFIAHURM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- YQEMORVAKMFKLG-UHFFFAOYSA-N glycerine monostearate Natural products CCCCCCCCCCCCCCCCCC(=O)OC(CO)CO YQEMORVAKMFKLG-UHFFFAOYSA-N 0.000 description 2
- SVUQHVRAGMNPLW-UHFFFAOYSA-N glycerol monostearate Natural products CCCCCCCCCCCCCCCCC(=O)OCC(O)CO SVUQHVRAGMNPLW-UHFFFAOYSA-N 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FHRLLBMTOFNWSE-QYCOUPDWSA-N (3S,4S,5R,6S)-1-(4-propylphenyl)dec-1-ene-2,3,4,5,6,7-hexol Chemical compound C(CC)C1=CC=C(C=C([C@H]([C@H]([C@@H]([C@H](C(O)CCC)O)O)O)O)O)C=C1 FHRLLBMTOFNWSE-QYCOUPDWSA-N 0.000 description 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-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
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- HVUMOYIDDBPOLL-XWVZOOPGSA-N Sorbitan monostearate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O HVUMOYIDDBPOLL-XWVZOOPGSA-N 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
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 229940125904 compound 1 Drugs 0.000 description 1
- 229940125782 compound 2 Drugs 0.000 description 1
- 229940126214 compound 3 Drugs 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 210000000497 foam cell Anatomy 0.000 description 1
- 238000013012 foaming technology Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- UHUSDOQQWJGJQS-UHFFFAOYSA-N glycerol 1,2-dioctadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)OC(=O)CCCCCCCCCCCCCCCCC UHUSDOQQWJGJQS-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229960001340 histamine Drugs 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229940049964 oleate Drugs 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid Chemical compound CCCCCCCC\C=C/CCCCCCCC(O)=O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000001587 sorbitan monostearate Substances 0.000 description 1
- 229940035048 sorbitan monostearate Drugs 0.000 description 1
- 235000011076 sorbitan monostearate Nutrition 0.000 description 1
- 239000012899 standard injection Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/08—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
Abstract
The invention discloses a foaming polypropylene composition, a preparation method and application thereof, belonging to the technical field of high molecular engineering plastics; the foaming polypropylene composition provided by the invention comprises the following components in parts by mass: 52-98 parts of PP resin, 0.3-3.2 parts of filler with high specific surface area, 0.3-2.2 parts of polyhydroxy compound and 0.3-2.2 parts of melt elasticity regulator. According to the foaming polypropylene composition provided by the invention, the PP resin with a certain melt flow rate is selected to compound the high specific surface filler, the polyhydroxy compound and the melt elasticity regulator, so that the expandability of the composition can be improved, the size of the foam holes of the composition can be reduced, and meanwhile, the foaming polypropylene composition has high fluidity and is favorable for quick forming of injection molding foaming; the preparation method provided by the invention is simple and is beneficial to actual production.
Description
Technical Field
The invention belongs to the technical field of high molecular engineering plastics, and particularly relates to a foaming polypropylene composition and a preparation method and application thereof.
Background
As a general plastic with high cost performance, the modified polypropylene has the characteristics of excellent mechanical properties of high strength and high toughness, chemical resistance, high heat resistance and the like, and is widely applied to household appliances and automobile products. Along with the increasing global call for environmental protection, energy conservation and consumption reduction, the automobile weight reduction becomes a great trend in the automobile industry. The polypropylene and the micro-foaming technology are combined, and the obtained micro-foaming polypropylene material has the advantages of small density, good thermal stability, chemical corrosion resistance and the like, is widely applied to automobile door panels, instrument panels and other automobile part materials, and becomes one of light materials with light weight and new energy source enthusiasm of vehicles.
Polypropylene belongs to semi-crystalline materials, has low melt strength, is easy to cause defects such as foam doubling, foam stringing and the like, and simultaneously, for door plate parts of automotive interior trim, the polypropylene materials applied to door plates at present have higher requirements on the flowability of the materials due to the fact that the integrated parts are large in size and complex in shape, and meanwhile, the thinning technology is combined, and the melt strength of polypropylene is usually obviously reduced along with the improvement of the flowability of the materials, so that the foaming effect of the materials is poor. Meanwhile, the chemical foaming is realized by mixing a foaming agent in the injection molding process and realizing the melt mixing and dispersion of the foaming agent and the polypropylene material under the screw rod and the heating of an injection molding machine, and the problem that the gas generated by the decomposition of the foaming agent is easy to accumulate in the polypropylene melt so as to cause coarse cells of the final material is solved.
There is therefore a need in the art to develop a polypropylene composition having high flowability while having excellent foaming properties.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a foaming polypropylene composition with excellent flow property and foaming property, and a preparation method and application thereof.
To achieve the above object, in a first aspect of the present invention, there is provided a foamed polypropylene composition comprising the following components in parts by mass: 52-98 parts of PP resin, 0.3-3.2 parts of filler with high specific surface area, 0.3-2.2 parts of polyhydroxy compound and 0.3-2.2 parts of melt elasticity regulator;
the average specific surface area of the high specific surface area filler is more than 40m 2 /g；
The hydroxyl content of the polyhydroxy compound is more than 6%;
after the sorbitol compound is mixed with the PP resin, the viscoelastic temperature of the PP resin is increased by more than 20 ℃;
the mass flow rate of the PP resin is 55-105g/10min at 230 ℃ and 2.16 Kg.
According to the foaming polypropylene composition provided by the invention, the PP resin with a certain melt mass flow rate is selected to compound the high specific surface filler, the polyhydroxy compound and the melt elasticity regulator, so that the expandability of the composition can be improved, the size of the foam holes of the composition can be reduced, the high fluidity of a final product is realized, and the quick forming of injection molding foaming is facilitated. Specifically, by adding a proper filler with high specific surface area and a melt elasticity regulator as heterogeneous nucleating agents of bubbles, the expandability and the cell size of the material are improved; further, the polyol improves the dispersion and distribution of the foaming agent in the melt, and simultaneously, the foam cell structure of the material is improved as a whole by combining with the adjustment of the viscoelasticity of the material by the melt elasticity adjusting agent.
The test method of the average specific surface area of the filler with high specific surface area is tested by referring to GB-T19587-2004.
The hydroxyl content in the polyhydroxy compound is the mass percent content of hydroxyl, and is calculated by a chemical formula (the calculation formula is that the hydroxyl content=17×N/M×100%, wherein N is the hydroxyl number in a molecular structure, and M is the molecular mass).
The method for calculating the change amount of the viscoelastic temperature of the PP resin after the melt elasticity regulator is mixed with the PP resin comprises the following steps: viscoelastic temperature variation = viscoelastic temperature of mixture after mixing PP resin with melt elasticity modifier-viscoelastic temperature of PP resin, wherein the viscoelastic temperature test method is: melt elasticity modifier was added to PP resin BX3920 (manufacturer, korean sk) at a ratio of 0.5wt%, and the modified plastic particles were obtained by screw extrusion granulation, and the particles were hot-pressed into 1mm plaques at 190 ℃ and cut out into 25mm discs for rotational rheology test, the rotational rheometer test parameters were as follows: 25mm plates at 1mm intervals, strain of 2%, frequency of 1rad/s, test temperature of 200-120 ℃ and cooling speed of-5 ℃/min.
The method for testing the melt mass flow rate of the PP resin at 230 ℃ and 2.16Kg is tested according to ISO 1133-2005; the PP resin is at least one of homo-polypropylene and co-polypropylene.
The high specific surface area may have an average specific surface area of > 40m 2 Any value of/g, e.g. 46-75m 2 /g、46-85m 2 /g、75-85m 2 Per g, etc., or may be > 40m 2 Any point value of/g or range of values consisting of any two points, e.g. 41m 2 /g、45m 2 /g、48m 2 /g、50m 2 /g、52m 2 /g、55m 2 /g、58m 2 /g、60m 2 /g、62m 2 /g、65m 2 /g、68m 2 /g、70m 2 /g、72m 2 /g、75m 2 /g、78m 2 /g、80m 2 /g、82m 2 /g、85m 2 /g、88m 2 /g、90m 2 /g、92m 2 /g、95m 2 /g、98m 2 /g、100m 2 Per g, etc., are limited to a length, and are not listed herein, the average specific surface area given in the present invention may be > 40m 2 The combination effect is excellent in the range of/g.
Preferably, the heightSpecific surface area average specific surface area of 46-75m 2 And/g. The inventors have found that when the average specific surface area of the high specific surface area is further selected to be 46-75m 2 At/g, the resultant product is more excellent in overall effect.
Illustratively, the hydroxyl group content of the polyhydroxy compound may be any value of > 6%, such as 9.4-11.8%, 9.4-12.5%, 11.8-12.5%, etc., or may be any point value of > 6% or a range of any two points, such as 6.1%, 6.3%, 6.5%, 6.8%, 7.0%, 7.2%, 7.5%, 7.8%, 8.0%, 8.2%, 8.5%, 8.8%, 9.0%, 9.2%, 9.5%, 9.8%, 10.0%, 10.2%, 10.5%, 10.8%, 11.0%, 11.2%, 11.5%, 11.8%, 12.0%, 12.2%, 12.5%, 12.8%, 13.0%, etc., and not specifically, excellent comprehensive effects can be obtained within the range of > 6% of the hydroxyl group content in the present invention. According to the invention, the research shows that as the hydroxyl has hydrophilicity, when the foaming polypropylene composition and the foaming agent are mixed for injection molding to prepare the foaming product, the foaming agent added in the injection molding process can be decomposed to generate carbon dioxide and water, and the carbon dioxide generated by decomposition is easy to dissolve in the water under the pressure of the screw of the injection molding machine, so that the dispersion and distribution condition of the carbon dioxide in a melt can be regulated by regulating the content of the hydrophilic hydroxyl, and further the foaming effect is influenced.
Preferably, the hydroxyl content of the polyhydroxy compound is 9.4-11.8%. The inventors have found that when the hydroxyl group content of the high polyol is further selected to be 9.4 to 11.8%, the resultant product is more excellent in combination effect.
The melt elasticity modifier is exemplified by the fact that the viscosity-elastic temperature of the PP resin can be increased by 31-36 ℃, 35-45 ℃, 25-35 ℃, etc., or by any point value or range of values composed of any two points above 20 ℃, such as 20 ℃, 22 ℃, 25 ℃, 28 ℃, 30 ℃, 32 ℃, 35 ℃, 38 ℃, 40 ℃, 42 ℃, 45 ℃, 48 ℃, 50 ℃ etc., after being mixed with the PP resin, and the melt elasticity modifier can be selected to obtain excellent effects as long as the viscosity-elastic temperature of the PP resin is increased by 20 ℃ or more after being mixed with the PP resin. According to the invention, the research shows that when the foamed polypropylene composition is mixed with the foaming agent and then used for preparing a foamed product, the melt strength of the material is obviously improved at the viscoelastic temperature transition point of the melt, so that the growth of cells is limited, the size of the cells is reduced and the combination of the cells is inhibited under the condition that the foaming agent is fully dispersed, and therefore, the amplitude of the increase of the viscoelastic temperature of the PP resin after the selected melt elasticity regulator is mixed with the PP resin can influence the foaming effect.
Preferably, the melt elasticity regulator is mixed with the PP resin to increase the viscoelastic temperature of the PP resin by 31-36 ℃, and the obtained product has more excellent comprehensive effect within the range of the increase range.
Illustratively, the PP resin may have a melt mass flow rate of 60-100g/10min, 60-80g/10min, 60-90g/10min, etc. at 230 ℃, or may have any point value of 55-105g/10min or a range of values consisting of any two points, such as 55g/10min, 60g/10min, 65g/10min, 70g/10min, 75g/10min, 80g/10min, 85g/10min, 90g/10min, 95g/10min, 100g/10min, 105g/10min, etc., not specifically recited herein; in the range of 55-105g/10min given by the present invention, excellent effects can be obtained.
Preferably, the PP resin has a melt mass flow rate of 80-90g/10min at 230 ℃ and 2.16Kg, and the obtained product has more excellent comprehensive effect within the given melt mass flow rate range.
The mass percentage of the PP resin in the foaming polypropylene composition is not less than 65%.
As a preferred embodiment of the expanded polypropylene composition of the present invention, the melt elasticity modifier is a sorbitol compound.
The inventors have found that when the melt elasticity modifier is selected to be a sorbitol compound, the size of the cell size can be reduced better, increasing the maximum weight reduction rate.
As a preferred embodiment of the foamed polypropylene composition of the present invention, the high specific surface area filler is at least one selected from the group consisting of titanium dioxide, vapor phase alumina, silica, organoclay, and porous silica gel.
The D50 particle size of the filler with high specific surface area is less than or equal to 50nm. The test method of the D50 particle size of the high specific area filler is that the particle size of the high specific area filler passes the laser particle size analyzer test, and is referred to ISO 13320-1-1999.
As a preferred embodiment of the foamed polypropylene composition of the present invention, the polyol is at least one selected from the group consisting of glycerol monostearate, sorbitan monolaurate, diethanolamide oleate and polyethylene glycol.
As a preferred embodiment of the expanded polypropylene composition of the present invention, the sorbitol compound is at least one selected from the group consisting of 1,3-2, 4-di (p-methylbenzylidene) sorbitol and 1,3-2, 4-di (3, 4-dimethylbenzylidene) sorbitol.
The inventor researches and finds that when the filler with high specific area, the polyhydroxy compound and the sorbitol compound are further selected as the substances, the comprehensive effect of the obtained product is more excellent.
As a preferable embodiment of the foaming polypropylene, the foaming polypropylene composition further comprises 0-20 parts of filler, 0-20 parts of toughening agent and 0-1 part of auxiliary agent.
As a preferred embodiment of the foamed polypropylene composition of the present invention, the filler is at least one selected from the group consisting of talc, calcium carbonate, barium sulfate, and glass fiber;
and/or the toughening agent is selected from at least one of POE, SEBS, EPDM;
and/or the auxiliary agent is at least one selected from antioxidant and light stabilizer.
Illustratively, the antioxidant may be at least one of a hindered phenol-based antioxidant, a phosphite-based antioxidant, and the light stabilizer may be a histamine-based light stabilizer.
In a second aspect of the present invention, there is provided a process for the preparation of a foamed polypropylene composition, the process comprising the steps of: and weighing and mixing the dried raw materials, melting and mixing, extruding and granulating to obtain the foaming polypropylene composition.
As a preferred embodiment of the preparation method of the invention, the temperature of the melt-mixing is 200-210 ℃ and the rotating speed of the screw is 350-450r/min.
In a third aspect of the present invention, there is provided a foamed article prepared from the foamed polypropylene composition of the present invention.
As a preferred embodiment of the foamed article of the present invention, the foaming agent comprises at least one of sodium bicarbonate, azodicarbonamide, and sulfonyl hydrazide. The foaming agent can also be added in the form of master batches, and the mass percentage of the foaming agent in the foaming agent master batches is 15-30% based on the foaming agent master batches.
As one embodiment of the foaming product, the mass percent of the foaming agent is 0.2-3% based on the foaming product. Preferably, the mass percent of the foaming agent is 0.25-1% based on the foaming product.
In a fourth aspect of the present invention, the present invention provides the use of said expanded polypropylene composition in the automotive field.
Illustratively, the foamed polypropylene composition may be used to prepare automotive door panels, instrument panels.
Compared with the prior art, the invention has the beneficial effects that:
according to the foaming polypropylene composition provided by the invention, the PP resin with a certain melt flow rate is selected to compound the filler with high specific surface area, the polyhydroxy compound and the melt elasticity regulator, so that the expandability of the composition can be improved, the size of the foam holes of the composition can be reduced, the high fluidity of a final product can be realized, and the quick forming of injection molding foaming is facilitated. The preparation method provided by the invention is simple and convenient to implement, has the advantages of cost and high design freedom, and the obtained product has high foamability, fine foam holes and high fluidity when being used for chemical foaming, and is suitable for high-speed molding of injection foaming.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
The reagents, methods and apparatus employed in the present invention are those conventional in the art unless otherwise indicated.
PP-1: k7780, melt index 80g/10min, petrifaction;
PP-2: the melt index is 90g/10min, and is prepared by blending and extruding K7780 and BX3920 according to the mass ratio of 1:1, and self-making;
PP-3: BX3900, melt index 60g/10min, korean SK;
PP-4: BX3920, melt index 100g/10min, korean SK;
PP-5: m1700, melt index 40g/10min, korean LG;
PP-6: PP7945E1, melt index 120g/10min, exxon Mobil;
high specific surface area filler 1: titanium dioxide, TTO-55D, japanese stone origin, average specific surface area of 75m 2 /g；
High specific surface area filler 2: titanium dioxide, PGNR-318G, pan Steel vanadium titanium, with an average specific surface area of 46m 2 /g；
High specific surface area filler 3: vapor phase alumina, alu C, wingchang De solid race, average specific surface area 85m 2 /g；
High specific surface area filler 4: titanium dioxide, CR-350, pan steel vanadium titanium, average specific surface area 15m 2 /g；
Polyhydroxy compound 1: glycerol monostearate, hydroxyl content 9.4%, commercially available;
polyhydroxy compound 2: sorbitan monostearate, 11.8% hydroxyl content, commercially available;
polyhydroxy compound 3: sorbitan monolaurate, hydroxyl group content 14.7%, commercially available;
polyhydroxy compound 4: glycerol distearate, with a hydroxyl content of 4.7%, commercially available;
melt elasticity modifier 1:1,3-2, 4-di (3, 4-dimethylbenzylidene) sorbitol, NA-98, is present and technology capable of raising the viscoelastic transition temperature of polypropylene by 36 ℃;
melt elasticity modifier 2: NA98 and NX8000K at NA98: NX8000 k=3: 2, the mass ratio of the mixture can lead the viscoelastic transition temperature of the polypropylene to be increased by 31 ℃;
melt elasticity modifier 3:1,3-2, 4-bis (p-methylbenzylidene) sorbitol, 3940, meliken, can raise the viscoelastic transition temperature of PP by 45 ℃;
melt elasticity modifier 4: NA98 and NX8000K at NA98: NX8000 k=3: 7, the mass ratio of the mixture can lead the viscoelastic transition temperature of the polypropylene to be increased by 25 ℃;
melt elasticity modifier 5:1,3-2, 4-bis (4-propylbenzylidene) -1-propylsorbitol, NX8000K, meliken, can raise the viscoelastic transition temperature of polypropylene by 15 ℃;
toughening agent: POE, ENGAGE 8137, dow chemical;
and (3) filling: talcum powder, TYT-777A, north sea group;
an antioxidant: the antioxidant 1010 and the antioxidant 168 are mixed in a mass ratio of 1:1 and are commercially available;
light stabilizers: UV-3853,2,2,6,6-tetramethyl-4-piperidinestearate, commercially available;
the toughening agents, fillers, antioxidants and light stabilizers used in the parallel experiments of the examples and comparative examples remained identical.
The method for testing the viscoelastic temperature comprises the following steps: melt elasticity modifier was added to PP resin BX3920 (manufacturer, korean sk) at a ratio of 0.5wt%, and the modified plastic particles were obtained by screw extrusion granulation, and the particles were hot-pressed into 1mm plaques at 190 ℃ and cut out into 25mm discs for rotational rheology test, the rotational rheometer test parameters were as follows: 25mm plates at 1mm intervals, strain of 2%, frequency of 1rad/s, test temperature of 200-120 ℃ and cooling speed of-5 ℃/min.
Examples 1 to 14 and comparative examples 1 to 9
The contents (parts by weight) of the components of the examples and comparative examples of the present invention are shown in tables 1 to 2;
TABLE 1
TABLE 2
The preparation methods of examples 1-14 and comparative examples 1-9 were:
the dried raw materials are weighed and mixed, then are melted and mixed at 200-210 ℃, the rotating speed of a screw is 400rpm, and then the mixture is extruded and granulated to obtain the foaming polypropylene composition.
Effect example
The effect examples of the present invention verify the properties of the products prepared in examples 1 to 14 and comparative examples 1 to 9; test pieces were prepared according to the corresponding standard injection molding, specifically prepared as follows: the compositions prepared in examples and comparative examples were subjected to a secondary injection molding experiment, specifically, the products prepared in examples 1 to 14 and comparative examples 1 to 9 were mixed with a foaming agent master batch (sodium bicarbonate master batch, EE25C, mass percent of sodium bicarbonate in master batch is 18%, japanese Yonghe) to foam, wherein the addition amount of the foaming agent master batch is 2% by weight, and the foaming process: 200 ℃, the injection speed is 140mm/S, the delayed die opening time is 0.5S, the secondary die opening speed is 4mm/S, and the original size of the injection template is 100mm x 1.8mm; the test is then performed, the test items including the following:
1. weight reduction rate: 100% > (maximum foam thickness-1.8)/maximum foam thickness; the testing method comprises the following steps: adopting a die with an initial thickness of 1.8mm to perform a foaming experiment, gradually increasing the die opening distance with 0.1mm as an interval until the surface of a foamed sample collapses, and calculating according to a given calculation formula, wherein the foaming thickness of the sample at the previous die opening distance is the maximum foaming thickness;
2. cell size: cutting 50 mm/2.57 mm sample bars at the middle position perpendicular to the injection molding flow direction, performing brittle failure in liquid nitrogen, photographing by a scanning electron microscope, and performing statistical calculation by image-pro;
3. melt flow rate (before foaming): referring to ISO1133-2005, test conditions: 210 ℃,2.16KG;
the results obtained from the test are shown in Table 3;
TABLE 3 Table 3
As can be seen from Table 3, when the technical scheme of the invention is adopted, the obtained product has excellent comprehensive effects, not only can meet the requirement of having excellent melt flow rate, but also has lower cell size and larger maximum weight reduction rate, specifically, the melt index of the obtained product is between 35.3 and 68.2g/10min, namely, the goal that the melt index is larger than 30g/10min can be ensured, the maximum weight reduction rate is more than 41.6%, and the cell size is less than 116.5 mu m;
as can be seen from examples 1 and comparative examples 1 to 4, the high specific surface area filler, the polyol and the melt elasticity controlling agent in the composition are not indispensable, and excellent comprehensive effects can be obtained only in the case where the three are added simultaneously, and when any one or all of the high specific surface area filler, the polyol and the melt elasticity controlling agent are not added in comparative examples 1 to 4, the cell size of the product obtained in comparative examples 1 to 4 is increased by 44.18 to 121.70% as compared with example 1; and when the filler with high specific surface area is not added in the comparative example 1, the maximum weight reduction rate of the obtained product is also obviously reduced, and compared with the example 1, the reduction range is 29.65 percent; when none of the high specific surface area filler, polyol and melt elasticity modifier of comparative example 4 was added, the maximum weight loss ratio of the resulting product was significantly reduced by 36.83% as compared to example 1;
as can be seen from examples 1, 5-7 and comparative examples 5-6, the melt index of the PP resin not only affects the melt index of the product, but also affects the foaming property of the product, and when the melt index of the PP resin is further selected to be 80-90g/10min, the comprehensive effect of the obtained product is better, specifically, the melt index of the obtained product is above 42.8g/10min, the maximum weight reduction rate is above 53.1%, and the cell size is below 98.5 μm; when the melt index of the PP resin used in comparative example 5 was too low, the melt index of the obtained product was also 30g/10min or less, the object of the melt index of more than 30g/10min could not be satisfied, and the cell size of the obtained product was also significantly increased, by 77.18% as compared with example 1; when the melt index of the PP resin used in comparative example 6 was too high, the cell size of the resulting product was significantly increased by 56.26% as compared to example 1;
as can be seen from examples 1, 8-9 and comparative example 7, the selection of the specific surface area of the high specific surface area filler also has an effect on the properties of the product, when the specific surface area of the high specific surface area filler is further selected to be 46-75m 2 In the process of/g, the comprehensive effect of the obtained product is better, specifically, the melt index of the obtained product is more than 41.7g/10min, the maximum weight reduction rate is more than 49.8%, and the cell size is less than 96.5 mu m; when the specific surface area of the high specific surface area filler used in comparative example 7 was too low, the maximum weight loss rate was reduced by 29.65% and the cell size was increased by 40.94% as compared with example 1;
as can be seen from examples 1, 10-11 and comparative example 8, the amount of hydroxyl groups in the polyol also affects the properties of the product, and when the hydroxyl groups in the polyol is further selected to be 9.4-11.8%, the resultant product has a better overall effect, specifically, the resultant product has a melt index of 40.8g/10min or more, a maximum weight loss of 52.3% or more and a cell size of 97.3 μm or less; when the hydroxyl group content in comparative example 8 was too low, the cell size of the resulting product was increased by 72.60% as compared with example 1,
as can be seen from examples 1, 12-14 and comparative example 9, the choice of melt elasticity modifier has an effect on the properties of the product, and when the melt elasticity modifier is further selected so that the viscoelastic transition temperature of polypropylene is 31-36 ℃, the resultant product has a better overall effect, specifically, the resultant product has a melt index of 42.5g/10min or more, a maximum weight loss of 52.4% or more and a cell size of 95.1 μm or less; when the melt elasticity modifier selected in comparative example 9 did not allow the viscoelastic temperature of the PP resin to be converted to 20 ℃ or higher, the maximum weight loss rate of the obtained product showed a decreasing trend compared with example 1, and the cell size was significantly increased by 81.66%.
Finally, it should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that those skilled in the art will understand that changes can be made to the technical solutions of the invention or equivalents thereof without departing from the spirit and scope of the technical solutions of the invention.
Claims (9)
1. The foaming polypropylene composition is characterized by comprising the following components in parts by mass:
52-98 parts of PP resin, 0.3-3.2 parts of filler with high specific surface area, 0.3-2.2 parts of polyhydroxy compound and 0.3-2.2 parts of melt elasticity regulator;
the average specific surface area of the high specific surface area filler is more than 40m 2 /g；
The hydroxyl content of the polyhydroxy compound is more than 6%;
after the melt elasticity regulator is mixed with the PP resin, the viscoelastic temperature of the PP resin is increased by more than 20 ℃;
the mass flow rate of the PP resin is 55-105g/10min at 230 ℃ and 2.16 Kg.
2. The expanded polypropylene composition according to claim 1, wherein the high surface area filler has an average specific surface area of from 46 to 75m 2 /g；
And/or the hydroxyl content of the polyhydroxy compound is 9.4-11.8%;
and/or, after the melt elasticity regulator is mixed with the PP resin, the viscoelastic temperature of the PP resin is increased by 31-36 ℃;
and/or the PP resin has a melt mass flow rate of 80-90g/10min at 230 ℃ and 2.16 Kg.
3. The expanded polypropylene composition according to claim 1, wherein the melt elasticity modifier is a sorbitol compound;
and/or the high specific surface filler is at least one selected from titanium dioxide, gas-phase alumina, porous silica gel, silicon dioxide and organoclay;
and/or the polyhydroxy compound is at least one selected from glycerin monostearate, sorbitan monolaurate, oleic acid diethanolamide and polyethylene glycol.
4. The expanded polypropylene composition according to claim 3, wherein the sorbitol compound is at least one selected from the group consisting of 1,3-2, 4-bis (p-methylbenzylidene) sorbitol and 1,3-2, 4-bis (3, 4-dimethylbenzylidene) sorbitol.
5. The expanded polypropylene composition according to claim 1, wherein the expanded polypropylene composition further comprises 0 to 20 parts of filler, 0 to 20 parts of toughening agent, and 0 to 1 part of auxiliary agent.
6. The expanded polypropylene composition according to claim 5, wherein the filler is at least one selected from the group consisting of talc, calcium carbonate, barium sulfate, glass fibers;
and/or the toughening agent is selected from at least one of POE, SEBS, EPDM;
and/or the auxiliary agent is at least one selected from antioxidant and light stabilizer.
7. A process for the preparation of a foamed polypropylene composition according to any one of claims 1 to 6, wherein said process comprises the steps of: and weighing and mixing the dried raw materials, melting and mixing, extruding and granulating to obtain the foaming polypropylene composition.
8. A foamed article characterized in that said foamed article is produced by foaming using the foamed polypropylene composition according to any one of claims 1 to 6.
9. Use of the expanded polypropylene composition according to any one of claims 1 to 6 in the automotive field.
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