WO2010050509A1 - 発泡成形用ポリプロピレン系樹脂組成物およびそれを用いた発泡成形体 - Google Patents
発泡成形用ポリプロピレン系樹脂組成物およびそれを用いた発泡成形体 Download PDFInfo
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- WO2010050509A1 WO2010050509A1 PCT/JP2009/068506 JP2009068506W WO2010050509A1 WO 2010050509 A1 WO2010050509 A1 WO 2010050509A1 JP 2009068506 W JP2009068506 W JP 2009068506W WO 2010050509 A1 WO2010050509 A1 WO 2010050509A1
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- 239000011261 inert gas Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 239000000314 lubricant Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- YSTQWZZQKCCBAY-UHFFFAOYSA-L methylaluminum(2+);dichloride Chemical compound C[Al](Cl)Cl YSTQWZZQKCCBAY-UHFFFAOYSA-L 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- UHZYTMXLRWXGPK-UHFFFAOYSA-N phosphorus pentachloride Chemical compound ClP(Cl)(Cl)(Cl)Cl UHZYTMXLRWXGPK-UHFFFAOYSA-N 0.000 description 1
- FAIAAWCVCHQXDN-UHFFFAOYSA-N phosphorus trichloride Chemical compound ClP(Cl)Cl FAIAAWCVCHQXDN-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229940032663 sodium bicarbonate / sodium citrate Drugs 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 239000001509 sodium citrate Substances 0.000 description 1
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- 235000010215 titanium dioxide Nutrition 0.000 description 1
- NDLIRBZKZSDGSO-UHFFFAOYSA-N tosyl azide Chemical compound CC1=CC=C(S(=O)(=O)[N-][N+]#N)C=C1 NDLIRBZKZSDGSO-UHFFFAOYSA-N 0.000 description 1
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- MCULRUJILOGHCJ-UHFFFAOYSA-N triisobutylaluminium Chemical compound CC(C)C[Al](CC(C)C)CC(C)C MCULRUJILOGHCJ-UHFFFAOYSA-N 0.000 description 1
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
- JTJFQBNJBPPZRI-UHFFFAOYSA-J vanadium tetrachloride Chemical compound Cl[V](Cl)(Cl)Cl JTJFQBNJBPPZRI-UHFFFAOYSA-J 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- DUNKXUFBGCUVQW-UHFFFAOYSA-J zirconium tetrachloride Chemical compound Cl[Zr](Cl)(Cl)Cl DUNKXUFBGCUVQW-UHFFFAOYSA-J 0.000 description 1
- PAPBSGBWRJIAAV-UHFFFAOYSA-N ε-Caprolactone Chemical compound O=C1CCCCCO1 PAPBSGBWRJIAAV-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- 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
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Definitions
- the present invention relates to a polypropylene resin composition for foam molding suitable for producing an injection foam molded article, and an injection foam molded article using the same. Specifically, the present invention relates to a polypropylene resin composition for injection foam molding containing a polypropylene polymer containing a high molecular weight component, and an injection foam molded article suitable for automobile interior and exterior parts using the same.
- Polypropylene resin is widely used as a resin material in various industrial fields such as daily necessities, housing, home appliances, and automobile parts because it is excellent in moldability, physical property balance, recycling characteristics, and cost performance.
- melt flow rate MFR
- melt tension melt tension
- the applicant of the present application is a polyolefin resin having a specific MFR, intrinsic viscosity, and shear stress (see Patent Document 1), and a propylene-based resin composition in which the amount of elution component depending on the elution temperature is within a specific range (patent Document 2) was found to be suitable for injection foam molding and has proposed these. Further, the applicant of the present invention has a high melt tension, excellent viscoelastic properties, and propylene obtained by producing an ultrahigh molecular weight propylene polymer component in the first stage as a polypropylene resin suitable as a raw material for a foam molded article. A multistage polymer is proposed.
- the present invention is suitable for injection foam molding, has a good balance between fluidity and melt tension, can achieve high-magnification foam molding, and can produce a foam molded article that is lightweight and has excellent appearance and mechanical strength. It is an object of the present invention to provide a composition and a foam-molded article using the composition.
- the present inventors have found that a specific impact polypropylene containing a high molecular weight component, or a mixture of impact polypropylene and a high molecular weight component-containing homopolypropylene, a rubber component and, if necessary, an inorganic material.
- a polypropylene resin composition containing a filler the present invention has found that a foamed molded article having an excellent balance between fluidity and melt tension, capable of achieving high-magnification foam molding, lightweight and excellent in appearance and mechanical strength, and the present invention Reached.
- the polypropylene resin composition for foam molding of the present invention is (AB) High molecular weight component-containing impact polypropylene: 50 to 90 parts by weight (C) Rubber component: 10 to 30 parts by weight (D) Inorganic filler: 0 to 20 parts by weight (However, (AB), (C), (D ) Is 100 parts by weight) Consists of The amount of propylene / ethylene copolymer specified as a normal temperature paraxylene-soluble component of the (AB) high molecular weight component-containing impact polypropylene is 4.5 to 31.0% by weight, (AB) The high molecular weight component-containing impact polypropylene contains a propylene polymer component having an intrinsic viscosity [ ⁇ ] in tetralin of 135 ° C. and 13.5 to 20.0 dl / g in an amount of 0.2 to 3.7% by weight. It is characterized by.
- the polypropylene resin composition for foam molding of the present invention in addition to the above (AB), (C), (D), (E) High-fluidity homopolypropylene: 5 to 20 parts by weight (provided that the total of (AB), (C), (D), and (E) is 100 parts by weight) Further including (E) The MFR measured at 230 ° C. under a load of 2.16 kg according to ASTM D-1238 of high fluidity homopolypropylene is 200 to 1000 g / 10 min.
- the polypropylene resin composition for foam molding is a component (AB) high molecular weight component-containing impact polypropylene, (A) Impact polypropylene: 45 to 87 parts by weight (B) High molecular weight component-containing homopolypropylene: 2 to 15 parts by weight (however, the total of (A), (B), (C), (D) is 100 parts by weight) And) Consists of (A) The amount of propylene / ethylene copolymer specified as a normal temperature para-xylene soluble component of the impact polypropylene is 5 to 30% by weight, and (B) the high molecular weight component-containing homopolypropylene is (I) a propylene homopolymer component having an intrinsic viscosity [ ⁇ ] in tetralin at 135 ° C.
- the polypropylene resin composition for foam molding of the present invention in addition to the above (A), (B), (C), (D), (E) High-fluidity homopolypropylene: 5 to 20 parts by weight (however, the total of (A), (B), (C), (D), and (E) is 100 parts by weight) Further including (E) The MFR measured at 230 ° C. under a load of 2.16 kg according to ASTM D-1238 of high fluidity homopolypropylene is 200 to 1000 g / 10 min.
- the MFR measured at 230 ° C. and 2.16 kg load according to ASTM D-1238 is 50 to 200 g / 10 min.
- the intrinsic viscosity [ ⁇ ] of the propylene / ethylene copolymer specified as a normal temperature para-xylene soluble component is preferably in the range of 3.5 to 10 dl / g.
- the rubber component is a copolymer of ethylene and an ⁇ -olefin having 3 to 10 carbon atoms, and has an MFR of 1 to 50 g / 10 min measured at 190 ° C. under a load of 2.16 kg according to ASTM D-1238. And the density is preferably in the range of 0.86 to 0.92 g / cm 3 ,
- the rubber component (C) is more preferably an ethylene / ⁇ -olefin elastomer produced with a single site catalyst.
- MFR 230 measured at 230 ° C. under a load of 2.16 kg according to ASTM D-1238 of the polypropylene resin composition for foam molding of the present invention is 30 to 200 g / 10 min, and MFR 230 and melt tension MT 180 are as follows: The relationship of the formulas (1) to (3) is preferable.
- the injection foam molded article of the present invention is characterized by being formed by injection foam molding of the polypropylene resin composition for foam molding of the present invention.
- Such an injection foam molded article of the present invention is preferably formed by injection foam molding using a chemical foaming agent and / or a physical foaming agent.
- the injection foam molded article of the present invention has a mold cavity clearance (T 0 ) at the start of injection of 1.0 to 2.0 mm, and T 0 and the length in the direction of expansion of the cross section of the cavity after retraction of the movable mold (
- the ratio (T 1 / T 0 ) to T 1 ) is preferably 1.1 to 5.0.
- the injection foam molded body of the present invention has a foam layer in the center sandwiched between solid skin layers, the solid skin layer on the surface of the molded body is 0.1 to 0.5 mm on one side, and the foam layer is 2 to 4 mm.
- 70% or more of the cells having a ratio of cell diameter perpendicular to the layer / cell diameter along the solid skin layer of 0.7 to 1.4, and the remaining foam layer cells are "perpendicular to the solid skin layer".
- 60% or more of the cells having a ratio of “cell diameter / cell diameter along the solid skin layer” of 0.1 to 0.9 are included.
- the injection foam molded body of the present invention is preferably an automobile interior / exterior part.
- the fluidity capable of injection filling into a thin and large cavity and the melt tension excellent in cell moldability are well balanced, suitable for injection foam molding, light weight and excellent mechanical strength. It is possible to provide a polypropylene resin composition for foam molding that can produce an expanded molded article. Further, according to the present invention, it is possible to provide an injection foam molded article that is lightweight, excellent in appearance, uniform in cell shape, and excellent in mechanical strength.
- FIG. 1 is a schematic diagram when the injection mold is in a clamped state.
- FIG. 2 is a schematic diagram when the injection mold is in a core back state.
- FIG. 3 shows plate thickness measurement positions for formability evaluation in the examples.
- FIG. 4 shows a plate thickness measurement position for flatness evaluation in the example.
- FIG. 5 is a photograph showing a cross section of the injection-foamed molded article obtained in Example 1.
- FIG. 6 is a photograph showing a cross section of the injection-foamed molded article obtained in Comparative Example 1.
- FIG. 7 is a photograph showing a cross section of the injection foam molded article obtained in Comparative Example 4.
- FIG. 8 is a plot showing the relationship between the melt tension (MT 180 ) and the melt flow rate (MFR 230 ) of the polypropylene resin compositions for foam molding of Examples and Comparative Examples. In FIG. 8, the following symbols are used.
- the polypropylene resin composition for foam molding of the present invention contains at least (AB) a high molecular weight component-containing impact polypropylene and (C) a rubber component, and (D) an inorganic filler as necessary. Containing. Moreover, even if (AB) high molecular weight component-containing impact polypropylene is replaced with (A) impact polypropylene and (B) high molecular weight component-containing homopolypropylene, the present invention has the same effect.
- the polypropylene resin composition for foam molding of the present invention may further contain (E) a high fluidity homopolypropylene.
- the (AB) high-molecular-weight component-containing impact polypropylene used in the present invention has a propylene / ethylene copolymer amount of 4.5 to 31.0 wt. %, Preferably 5 to 30% by weight, more preferably 6 to 28% by weight.
- (AB) high molecular weight component-containing impact polypropylene contains propylene polymer component having an intrinsic viscosity [ ⁇ ] in tetralin of 13.5 to 20.0 dl / g at 135 ° C. of 0.2 to 3.7% by weight. , Preferably 0.5 to 3.5% by weight, more preferably 1.0 to 3.0% by weight.
- propylene polymer component (X) a propylene polymer component having an intrinsic viscosity [ ⁇ ] in the above range
- AB high molecular weight component-containing impact polypropylene
- the intrinsic viscosity [ ⁇ ] of the propylene polymer component (X) is 13.5 to 20.0 dl / g, preferably 14 to 19 dl / g, more preferably 15 to 18 dl / g.
- the weight fraction of the propylene polymer component (X) in the high molecular weight component-containing impact polypropylene is 0.00.
- the melt tension is insufficient, and the foaming performance of the resulting polypropylene resin composition for foam molding may be insufficient.
- the melt flow rate (MFR) of the (AB) high molecular weight component-containing impact polypropylene according to the present invention measured at 230 ° C. under a 2.16 kg load according to ASTM D-1238 is usually 40 to 190 g / 10 min, preferably 50 to It is 170 g / 10 min, more preferably 60 to 150 g / 10 min.
- the intrinsic viscosity [ ⁇ ] of the propylene / ethylene copolymer specified as a normal temperature paraxylene-soluble component in the high-molecular-weight component-containing impact polypropylene is usually 3.5 to 10 dl / g, preferably 3.5 to The range is 8 dl / g.
- the content of the propylene / ethylene copolymer specified as a normal temperature paraxylene soluble component in the (AB) high molecular weight component-containing impact polypropylene is 4.5 to 31.0% by weight, preferably 5 to 30% by weight. %, More preferably about 8 to 27% by weight.
- the ethylene content in the propylene / ethylene copolymer is preferably 20 to 45% by weight, more preferably 25 to 40% by weight.
- the propylene homopolymer part contained in the room temperature paraxylene insoluble component in the high molecular weight component-containing impact polypropylene preferably has excellent stereoregularity, for example, an isotactic pentad fraction (mmmm fraction). , Preferably 95.0% or more, more preferably 97.0% or more.
- mmmm fraction isotactic pentad fraction
- a foamed molded article having high resin crystallinity and high rigidity can be produced.
- the isotactic pentad fraction is a value measured using 13 C-NMR, and indicates the abundance of isotactic chains in pentad units in a polypropylene molecular chain. It is the fraction of propylene monomer units at the center of a chain in which five propylene monomer units are continuously meso-bonded. Specifically, it is a value calculated as a fraction of the mmmm peak in the total absorption peak in the methyl carbon region observed in the 13 C-NMR spectrum.
- the (AB) high molecular weight component-containing impact polypropylene used in the present invention may contain a branched olefin polymer in a proportion of usually 0.1% by weight or less, preferably 0.05% by weight or less. Since the branched olefin polymer acts as a nucleating agent for the (AB) high molecular weight component-containing impact polypropylene, the isotactic pentad fraction of the propylene homopolymer portion can be increased and the moldability can be improved.
- Such branched olefin polymers include 3-methyl-1-butene, 3,3-dimethyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3-methyl-1 -Homopolymers of branched olefins such as pentene or copolymers containing them can be used. Of these, 3-methyl-1-butene is preferred.
- the production method of (AB) high molecular weight component-containing impact polypropylene used in the present invention is not particularly limited.
- propylene homopolymerization is carried out as a first step in the presence of an olefin stereoregular polymerization catalyst. It can be produced by adopting a process in which propylene and ethylene are copolymerized as the second stage and ethylene is homopolymerized as the third stage as necessary.
- the polymerization catalyst a Ziegler-Natta catalyst, a metallocene catalyst, or the like can be used.
- the high molecular weight component-containing impact polypropylene may be used alone or in combination of two or more. When using 2 or more types, it is preferable that (AB) high molecular weight component containing impact polypropylene which is the sum total satisfy
- the (A) impact polypropylene used in the present invention preferably has a propylene / ethylene copolymer content specified as a normal temperature paraxylene soluble component of 5 to 30% by weight, more preferably 8 to 27% by weight. It is.
- the propylene homopolymer portion and the polyethylene portion contained as necessary are insoluble in normal temperature paraxylene, and the propylene / ethylene random copolymer portion is soluble in normal temperature paraxylene.
- the content of the normal temperature para-xylene-soluble component in the impact polypropylene is in the above range because the balance between rigidity and impact resistance is excellent.
- melt flow rate (MFR) of (A) impact polypropylene measured by ASTM D-1238 at 230 ° C. and 2.16 kg load is preferably 50 to 200 g / 10 min, more preferably 55 to 150 g / 10 min. It is.
- the propylene / ethylene copolymer specified as a normal temperature paraxylene soluble component in impact polypropylene preferably has an intrinsic viscosity [ ⁇ ] of usually 3.5 to 10 dl / g, more preferably 3.5 to A range of 8 dl / g is desirable.
- the content of the propylene / ethylene copolymer specified as a normal temperature paraxylene-soluble component in the impact polypropylene (A) is preferably about 5 to 30% by weight, more preferably about 8 to 27% by weight
- the ethylene content in the propylene / ethylene copolymer is preferably about 20 to 45% by weight, more preferably about 25 to 40% by weight.
- the propylene homopolymer part contained in the normal temperature para-xylene insoluble component in impact polypropylene is preferably excellent in stereoregularity, for example, an isotactic pentad fraction (mmmm fraction) is preferably 95. It is desirable that it is 0.0% or more, more preferably 97.0% or more.
- an isotactic pentad fraction is preferably 95. It is desirable that it is 0.0% or more, more preferably 97.0% or more.
- the isotactic pentad fraction is a value measured using 13 C-NMR, and indicates the abundance of isotactic chains in pentad units in a polypropylene molecular chain. It is the fraction of propylene monomer units at the center of a chain in which five propylene monomer units are continuously meso-bonded. Specifically, it is a value calculated as a fraction of the mmmm peak in the total absorption peak in the methyl carbon region observed in the 13 C-NMR spectrum.
- the (A) impact polypropylene used in the present invention may contain a branched olefin polymer in a proportion of 0.1% by weight or less, preferably 0.05% by weight or less. Since the branched olefin polymer acts as a nucleating agent for (A) impact polypropylene, the isotactic pentad fraction of the propylene homopolymer portion can be increased and the moldability can be improved.
- Such branched olefin polymers include 3-methyl-1-butene, 3,3-dimethyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3-methyl-1 -Homopolymers of branched olefins such as pentene or copolymers containing them can be used. Of these, 3-methyl-1-butene is preferred.
- the production method of (A) impact polypropylene used in the present invention is not particularly limited.
- propylene homopolymerization is performed as a first step, and second Propylene and ethylene can be copolymerized as a step, and ethylene can be homopolymerized as a third step if necessary.
- a Ziegler-Natta catalyst, a metallocene catalyst, or the like can be used as the polymerization catalyst.
- (A) One type of impact polypropylene may be used alone, or two or more types may be used in combination. When using 2 or more types, it is preferable that (A) impact polypropylene which is the sum satisfies the above range.
- (B) High molecular weight component-containing homopolypropylene (B) High molecular weight component-containing homopolypropylene (B) High molecular weight component-containing homopolypropylene used in the present invention is (I) A propylene homopolymer component (hereinafter referred to as component (i)) having an intrinsic viscosity [ ⁇ ] in tetralin of 135 ° C. of more than 13.5 to 20 dl / g is preferably 5 to 22% by weight, more preferably 8 Up to 20% by weight, (Ii) A propylene homopolymer component (hereinafter referred to as component (ii)) having an intrinsic viscosity [ ⁇ ] in tetralin of 135 ° C. of 0.5 to 3.0 dl / g is preferably 78 to 95% by weight, more preferably Contains 80-92% by weight.
- the high molecular weight component-containing homopolypropylene has a high melt tension and a viscoelastic property adjusted by containing a specific amount of the component (i), that is, the ultrahigh molecular weight propylene polymer component. It is a chain-like propylene polymer.
- the intrinsic viscosity of component (i) is preferably 14.5 to 20 dl / g, more preferably 15.5 to 18 dl / g.
- the weight fraction of the component (i) in the (B) high molecular weight component-containing homopolypropylene is more preferably 10 to 20% by weight.
- the melt tension is insufficient and the resulting foam molding
- the foaming performance of the polypropylene resin composition for use may be insufficient.
- the weight fraction of (i) component exceeds 22 weight%, the injection moldability of the polypropylene resin composition for foam molding obtained may become inferior.
- the intrinsic viscosity of component (ii) is preferably 0.5 to 3.0 dl / g, more preferably 0.5 to 2.0 dl / g, and particularly preferably 0.5 to 1.5 dl / g.
- the weight fraction of component (ii) is preferably 80 to 92% by weight, more preferably 80 to 90% by weight.
- the resulting polypropylene resin composition for foam molding When the intrinsic viscosity of the component (ii) is less than 0.5 dl / g or when the weight fraction of the component (ii) in (B) exceeds 95% by weight, the resulting polypropylene resin composition for foam molding The melt tension of the product becomes insufficient, and foam molding may be difficult. Moreover, if the weight fraction of (ii) component is less than 80 weight%, the injection moldability of the obtained polypropylene resin composition for foam molding may be poor.
- the high molecular weight component-containing homopolypropylene according to the present invention has an MFR measured at 230 ° C. and a load of 2.16 kg, preferably 7 g / 10 min or less, more preferably 5 g / 10 min or less. When it exceeds 7 g / 10 min, the effect of improving the melt tension of the obtained polypropylene resin composition for foam molding is low, and it may be difficult to mold a homogeneous foam during high foaming.
- the production method of the (B) high molecular weight component-containing homopolypropylene according to the present invention is not particularly limited.
- the following components (a) and (b), or the following components (a), (b) and Using the olefin polymerization catalyst comprising (c), it can be produced by polymerizing propylene in two or more polymerization steps.
- B an organoaluminum compound,
- C Cyclic ester compound.
- organoaluminum compound for reducing titanium tetrachloride in the solid catalyst component (a) examples include (a) alkylaluminum dihalide, specifically, methylaluminum dichloride, ethylaluminum dichloride, and n-propylaluminum dichloride.
- alkylaluminum sesquihalides specifically ethylaluminum sesquichloride
- dialkylaluminum halides specifically dimethylaluminum chloride, diethylaluminum chloride, di-n-propylaluminum chloride, and diethylaluminum Bromide
- trialkylaluminum specifically trimethylaluminum, triethylaluminum, and triisobutylaluminum
- Dialkyl aluminum hydride specifically, may be mentioned diethyl aluminum hydride and the like.
- alkyl is lower alkyl such as methyl, ethyl, propyl, butyl and the like.
- the “halide” is chloride or bromide, and the former is particularly common.
- the reduction reaction with an organoaluminum compound to obtain titanium trichloride is usually carried out in a temperature range of ⁇ 60 to 60 ° C., preferably ⁇ 30 to 30 ° C. When the temperature is lower than the above temperature range, a long time is required for the reduction reaction. When the temperature is higher than the above temperature range, partial reduction occurs, which is not preferable.
- the reduction reaction is preferably performed in an inert hydrocarbon solvent such as pentane, hexane, heptane, octane and decane.
- the titanium trichloride obtained by the reduction reaction of titanium tetrachloride with the organoaluminum compound is further subjected to ether treatment and electron acceptor treatment.
- Ether compounds preferably used in the ether treatment of titanium trichloride include diethyl ether, di-n-propyl ether, di-n-butyl ether, diisoamyl ether, dineopentyl ether, di-n-hexyl ether, di- Examples include ether compounds in which each hydrocarbon residue is a chain hydrocarbon having 2 to 8 carbon atoms, such as n-octyl ether, di-2-ethylhexyl ether, methyl-n-butyl ether, and ethyl isobutyl ether. In particular, di-n-butyl ether is preferably used.
- titanium tetrachloride silicon tetrachloride
- three Examples thereof include boron fluoride, boron trichloride, antimony pentachloride, gallium trichloride, iron trichloride, tellurium dichloride, tin tetrachloride, phosphorus trichloride, phosphorus pentachloride, vanadium tetrachloride, and zirconium tetrachloride.
- the treatment with the ether compound of titanium trichloride and the electron acceptor may be carried out using a mixture of both treatment agents, and after treatment with one, treatment with the other. You may go. Among these, the latter is preferable, and it is more preferable to perform the electron acceptor treatment after the ether treatment.
- the ether treatment of titanium trichloride is performed by bringing the titanium trichloride into contact with the ether compound.
- the treatment of titanium trichloride with an ether compound is advantageously performed by bringing both into contact in the presence of a diluent.
- a diluent For such diluents, it is preferable to use inert hydrocarbon compounds such as hexane, heptane, octane, decane, benzene and toluene.
- the treatment temperature in the ether treatment is preferably 0 to 100 ° C.
- the treatment time is not particularly limited, but is usually in the range of 20 minutes to 5 hours.
- the amount of the ether compound used is generally in the range of 0.05 to 3.0 mol, preferably 0.5 to 1.5 mol, per mol of titanium trichloride.
- amount of the ether compound used is less than the above range, it is not preferable because the stereoregularity of the produced polymer cannot be sufficiently improved.
- the said range is exceeded, although the stereoregularity of a production
- titanium trichloride treated with an organoaluminum compound or an ether compound is a composition mainly composed of titanium trichloride.
- Solvay type titanium trichloride can be suitably used as such a solid catalyst component (a).
- organoaluminum compound (b) examples include the same compounds as described above.
- Examples of the cyclic ester compound (c) include ⁇ -lactone, ⁇ -lactone, ⁇ -lactone and the like. Of these, ⁇ -lactone is preferable.
- the olefin polymerization catalyst used in the production of the (B) high molecular weight component-containing homopolypropylene according to the present invention can be prepared by mixing the above components (a) to (c).
- (B) In the production of the high molecular weight component-containing homopolypropylene, it is preferable to polymerize propylene in the absence of hydrogen at the first stage among the two or more stages of the polymerization process.
- “in the absence of hydrogen” means substantially in the absence of hydrogen, and includes not only the case where there is no hydrogen at all, but also the case where a trace amount of hydrogen is present (for example, about 10 molppm). . That is, a trace amount of hydrogen may be present as long as the intrinsic viscosity of the first-stage propylene polymer or propylene copolymer measured in 135 ° C. tetralin is not less than 10 dl / g.
- an ultrahigh molecular weight propylene polymer as component (i) can be produced.
- Component production conditions are as follows: in the absence of hydrogen, the raw material monomer is the polymerization temperature, preferably 20 to 80 ° C., more preferably 40 to 70 ° C., and the polymerization pressure is generally normal pressure to 1.47 MPa, It is preferably produced by slurry polymerization under conditions of 0.39 to 1.18 MPa.
- component (ii) which is a low molecular weight component
- the production conditions for component (ii) are not particularly limited except that the above olefin polymerization catalyst is used, but the raw material monomer is preferably at a polymerization temperature of 20 to 80 ° C., more preferably 60 to 70 ° C.
- the pressure is generally from normal pressure to 1.47 MPa, preferably from 0.19 to 1.18 MPa, and it is preferable to carry out the polymerization under conditions where hydrogen as a molecular weight regulator is present.
- the propylene polymer component having an intrinsic viscosity [ ⁇ ] in tetralin of 135 ° C. and tetralin exceeding 13.5 to 20 dl / g is obtained in the first stage polymerization step. 5 to 22 wt% is produced, and in the second polymerization step, propylene polymer components having an intrinsic viscosity [ ⁇ ] in tetralin of 0.5 to 3.0 dl / g at 135 ° C are produced in an amount of 78 to 95 wt%. It is preferable to make it.
- preliminary polymerization may be performed before the main polymerization.
- the powder morphology can be maintained well.
- the polymerization temperature is preferably 0 to 80 ° C., more preferably 10 to 60 ° C.
- the polymerization amount is preferably 0.001 to 100 g, more preferably 0. It is preferable to polymerize 1 to 10 g of propylene.
- the (C) rubber component used in the present invention is a phase of the (AB) high molecular weight component-containing impact polypropylene or the (A) impact polypropylene and (B) high molecular weight component-containing homopolypropylene.
- a rubber component having excellent solubility can be used without limitation, but in the present invention, it is preferable to use a copolymer of ethylene and an ⁇ -olefin having 3 to 10 carbon atoms as the (C) rubber component.
- Examples of the ⁇ -olefin copolymerized with ethylene include propylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-heptene, 1-octene, -C3-C10 ⁇ -olefins such as nonene and 1-decene are used, and one or more of these are used. Of these ⁇ -olefins, 1-butene and 1-octene are particularly preferred.
- the MFR of the rubber component (C) used in the present invention measured at 190 ° C. under a load of 2.16 kg according to ASTM D-1238, is preferably 1 to 50 g / 10 min, more preferably 10 to 40 g / 10 min, and the density is The range is preferably 0.86 to 0.92 g / cm 3 .
- Such (C) rubber component is preferably an ethylene / ⁇ -olefin elastomer produced by a single site catalyst such as a metallocene catalyst.
- the ethylene / ⁇ -olefin elastomer produced by a single site catalyst such as a metallocene catalyst has a weight average molecular weight to number average molecular weight ratio (molecular weight distribution: Mw / Mn) and an ethylene / ⁇ -olefin copolymer composition distribution. Since it is narrow, the composition is excellent in that uniform and stable flow characteristics (rheology) and dispersion form (morphology) can be obtained.
- the single-site catalyst that can be used in the present application include The Dow Chemical Company, ENGAGE 8407, Mitsui Chemicals A-35070S, and the like, but the elastomer component is not limited thereto.
- the rubber component may be used alone or in combination of two or more, but the rubber component as a whole preferably satisfies the above MFR and density.
- Inorganic filler that can be used in the present invention is not particularly limited.
- talc is most preferred.
- the shape of the inorganic filler is not particularly limited, but those having an average particle diameter measured by a laser method of usually 0.5 to 20 ⁇ m, preferably 1.0 to 15 ⁇ m are suitably used. .
- the (E) high fluidity homopolypropylene that can be used in the present invention preferably has an MFR measured at 230 ° C. under a load of 2.16 kg according to ASTM D-1238, preferably 200 to 1000 g / 10 min. More preferably, it is 220 to 800 g / 10 min, and still more preferably 240 to 700 g / 10 min.
- the MFR of the high-fluidity homopolypropylene is within the above range, the MFR of the resulting polypropylene resin composition for foam molding can be improved, and the fluidity can be further improved. .
- the polypropylene resin composition for foam molding of the present invention may contain various additives as necessary within the range not impairing the purpose.
- Additives include nucleating agents, antioxidants, hydrochloric acid absorbents, heat stabilizers, weathering stabilizers, light stabilizers, UV absorbers, lubricants, antistatic agents, flame retardants, pigments, dyes, dispersants, copper damage
- examples thereof include flowability improvers such as inhibitors, neutralizers, plasticizers, crosslinkers, peroxides, weld strength improvers, natural oils, synthetic oils, waxes and the like.
- Polypropylene resin composition for foam molding is 100 parts by weight of the total of (AB) high molecular weight component-containing impact polypropylene, (C) rubber component and (D) inorganic filler.
- composition of the polypropylene resin composition for foam molding of the present invention when (AB) high molecular weight component-containing impact polypropylene is replaced with (A) impact polypropylene and (B) high molecular weight component-containing homopolypropylene is (A ) Impact polypropylene, (B) High molecular weight component-containing homopolypropylene, (C) Rubber component, and (D) Inorganic filler is 100 parts by weight, (A) component: 45 to 87 parts by weight, (B) Component: 2 to 15 parts by weight, (C) component: 10 to 30 parts by weight, (D) component: 0 to 20 parts by weight, Preferably, (A) component: 47 to 86 parts by weight, (B) component: 3 to 12 parts by weight, (C) component: 10 to 25 parts by weight, and (D) component: 1 to 20 parts by weight. , More preferably, (A) component: 52 to 82 parts by weight, (B) component: 3 to 10 parts by weight, (C) component: 10
- the polypropylene resin composition for foam molding of the present invention usually has a melt flow rate (MFR 230 ) measured by ASTM D-1238 (230 ° C., load 2.16 kg) in a state containing no foaming agent of 30 to 200 g / 10 min, preferably 40 to 120 g / 10 min, particularly preferably 50 to 100 g / 10 min, is preferable because it is suitable for injection foam molding. In such a range, the moldability is excellent, and injection using a thin cavity is used. This is desirable because it can be suitably used for foam molding.
- MFR 230 melt flow rate measured by ASTM D-1238
- the polypropylene resin composition for foam molding of the present invention can be suitably used for foam molding by adding a foaming agent, and can be particularly suitably used for injection foam molding.
- the type and addition amount of the foaming agent are selected in consideration of the amount of gas generated from the foaming agent and the desired foaming ratio in accordance with the composition of the resin composition and the required physical properties of the foamed molded product.
- the polypropylene resin composition for foam molding of the present invention has a melt flow rate (MFR 230 ) measured by ASTM D-1238 (230 ° C., load 2.16 kg) and ⁇ 2 at 180 ° C. in a state in which no foaming agent is contained.
- the melt tension (MT 180 ) measured as a load (g) when a strand was drawn from a capillary with a length of 0.095 mm and a length of 8 mm at an extrusion speed of 15 mm / min and a winding speed of 15 m / min is expressed by the following formula (1) to It is preferable to satisfy the relationship (3).
- the above formula (1) is preferably represented by formula (4), more preferably by formula (5).
- the above formula (2) is preferably represented by formula (6), more preferably by formula (7).
- the formula (3) is preferably represented by the formula (8), more preferably the formula (9).
- the polypropylene resin composition for foam molding satisfies the relationship of the above formulas (1) to (3), it becomes a polypropylene resin composition in which the balance between fluidity and melt tension is highly maintained, so that it is thin at the injection stage. It has a resin characteristic that can be filled in the cavity and can form a stable foam cell at a high magnification in the foaming stage. Therefore, the polypropylene resin composition for foam molding according to the present invention that satisfies the requirements can be suitably used particularly as a resin composition for injection foam molding.
- a foam molded article is produced using the above-described polypropylene resin composition for foam molding and a foaming agent.
- the foaming agent used in the method for producing an injection foam molded article of the present invention is not particularly limited, and may be a chemical foaming agent or a physical foaming agent, a solvent-type foaming agent, or a decomposition-type foaming agent. It may be an agent, a gaseous physical foam material, or a combination thereof.
- Solvent type foaming agent is a substance that functions as a foaming agent by being generally injected from a cylinder portion of an injection molding machine and absorbed or dissolved in a molten raw material resin, and then evaporated in an injection mold.
- Low boiling point aliphatic hydrocarbons such as propane, butane, neopentane, heptane, isohexane, hexane, isoheptane, heptane, low boiling point fluorine-containing hydrocarbons typified by Freon gas, and the like can be used.
- the decomposable foaming agent is pre-blended with the raw material resin composition and then supplied to the injection molding machine.
- the foaming agent decomposes under the cylinder temperature conditions of the injection molding machine to generate gases such as carbon dioxide and nitrogen gas.
- gases such as carbon dioxide and nitrogen gas.
- a compound It may be an inorganic foaming agent or an organic foaming agent, and an organic acid such as citric acid that promotes the generation of gas or an organic acid metal salt such as sodium citrate is used as a foaming aid. You may add together as an agent.
- the decomposable foaming agent include the following compounds.
- Inorganic foaming agent sodium bicarbonate, sodium carbonate, ammonium bicarbonate, ammonium carbonate, ammonium nitrite
- Organic foaming agent (a) N-nitroso compound: N, N′-dinitrosotephthalamide, N, N′-dinitrosopentamethylenetetramine; (b) azo compound: azodicarbonamide, azobisisobutyronitrile, azocyclohexylnitrile, azodiaminobenzene, barium azodicarboxylate; (c) sulfonyl hydrazide compound: benzene Sulfonylhydrazide, toluenesulfonylhydrazide, p, p'- Oxybis (benzenesulfenylhydrazide), diphenylsulfone-3,3'- (D) Azide compound: calcium azide, 4,
- Inert gases such as nitrogen, argon, helium, neon, and astatine.
- nitrogen, argon, helium, neon, and astatine are the most excellent because they do not need to be vaporized, are inexpensive, and have very little environmental pollution and fire hazard.
- foaming agents may be used alone or in combination of two or more.
- a foaming agent can also be previously mix
- foaming agents carbonates or bicarbonates such as sodium bicarbonate are preferable, and it is desirable to use an organic carboxylic acid in combination as a foaming aid.
- the mixing ratio of the carbonate or bicarbonate to the organic carboxylic acid is preferably in the range of 30 to 65 parts by weight for the carbonate or bicarbonate and 35 to 70 parts by weight for the organic carboxylic acid.
- the total amount of both is 100 parts by weight.
- the masterbatch containing them may be made beforehand, and you may take the prescription mix
- the addition amount of the foaming agent is selected in consideration of the amount of gas generated from the foaming agent and the desired foaming ratio depending on the required properties of the foamed molded article to be produced.
- the amount is usually 0.1 to 10 parts by weight, preferably 0.4 to 5.0 parts by weight, and more preferably 0.7 to 3.0 parts by weight with respect to parts.
- the addition amount of the foaming agent is within such a range, it is possible to obtain a foamed molded article in which the cell diameter is uniform and the cells are uniformly dispersed.
- a foaming agent is added to the above-described polypropylene resin composition for foam molding, and plasticized and kneaded by an injection molding machine to obtain a plasticized resin composition, which is injection foamed. Mold.
- the foaming agent may be added to the polypropylene resin composition before being supplied to the injection molding machine, or by supplying the foaming agent into an injection molding machine in which the polypropylene resin composition is melt-kneaded. May be.
- Injection foam molding is performed by injection-filling a plasticized resin composition from an injection molding machine into a mold cavity, and then increasing the volume of the cavity to foam the plasticized resin composition to produce a foam molded article. .
- the molding die used for injection foam molding is composed of a fixed mold and a movable mold, and these are preferably in a mold-clamped state when the plasticized resin composition is injected and filled.
- the volume of the cavity can be increased by retracting the movable mold (core back) to widen the cavity, and it is preferable to increase the volume after an injection filling, particularly after an appropriate time.
- a cavity structure including a fixed mold and a movable mold will be described with reference to FIGS. 1 and 2.
- the initial position (FIG. 1) of the movable mold 2 is the position when the fixed mold 1 and the movable mold 2 are in the closest clamping state, and the melting of the foamable resin composition used for one molding is performed.
- a cavity that is almost the same volume as the volume that is filled in the unfoamed body and that is close to the product shape is formed.
- the length in the expanding direction at the start of injection of the cavity 3 formed between the fixed mold 1 and the movable mold 2, that is, the cavity clearance (T 0 ) of the mold at the start of injection is preferably 1.
- a range of 0 to 2.0 mm, more preferably 1.0 to 1.8 mm, and still more preferably 1.0 to 1.5 mm is desirable.
- the injection filling cavity is narrow, and the plasticized resin composition may not be sufficiently supplied and filled into the cavity due to an increase in viscosity or solidification of the plasticized resin composition.
- the resin is rapidly cooled by the mold, and even if the core is backed up, foaming does not occur sufficiently, resulting in poor foaming, and the generation of burrs due to high injection filling pressure is suppressed. Therefore, the equipment cost becomes high.
- the injection time of the plasticized resin composition into the mold cavity is not particularly limited, but is preferably about 0.7 to 5.0 s, more preferably about 0.7 to 4.0 s.
- a delay time of preferably 0 to 3 s, more preferably 0.5 to 3 s is provided, and then the movable mold constituting the cavity is preferably 1 to 50 mm / s, more preferably 1 to 20 mm / s It is desirable to expand the cavity volume by retreating (core back) with (FIG. 2).
- the thickness of the skin layer can be controlled, and when the delay time is lengthened, the skin layer can be thickened, and as a result, mechanical properties such as rigidity can be enhanced.
- the enlargement ratio of the cavity volume is usually 1.1 to 4.0 times, preferably 1.5 to 3.0 times, more preferably 2.0 to 2.5 times.
- T 0 and the ratio (T 1 / T 0) of the cross-sectional expanding direction length of the cavity 3 after the movable mold 2 backward (T 1) from 1.1 to 5.0 and preferably 1.5 to 4.0.
- T 1 / T 0 is less than 1.1, it is the same as an unfoamed molded article, and a desired rigidity cannot be obtained.
- the core moving speed during core back varies depending on the thickness of the molded body, the type of resin, the type of foaming agent, the mold temperature, and the resin temperature.
- carbon dioxide is used as a physical foaming agent, and ordinary polypropylene is used. In this case, about 0.5 to 30 mm / s is preferable. If the core moving speed is too slow, the resin will solidify in the middle of the core back, and sufficient foaming ratio will not be obtained, and if it is too fast, cell generation and growth will not follow the core movement, and the cell will break and the appearance will be good Can not be obtained.
- the temperature of the resin to be injected and the mold temperature vary depending on the thickness of the molded body, the type of resin, the type and amount of foaming agent, etc., but the temperatures normally used for molding polypropylene resins are sufficient, and the product thickness is In order to obtain a thin product or a product with a high expansion ratio, it is preferable to set it higher than the normal mold temperature.
- the temperature of the resin to be injected is 170 to 250 ° C., preferably 180 to 220 ° C.
- the mold temperature of the fixed mold and the movable mold is 10 to 100 ° C., preferably 30 to 80 ° C.
- the pressure inside the mold is 5 to 50 MPa, preferably 10 to 30 MPa.
- the injection pressure is usually 10 to 250 MPa, preferably 12 to 200 MPa.
- the resin in the portion in contact with the mold is solidified faster than the internal resin, and the solid skin is not foamed on the surface of the molded product
- An injection foam molded article having a layer and a foam layer in the center is obtained. Since the injection-foamed molded body has an unfoamed solid skin layer on the surface of the molded product, it is possible to obtain and maintain a hard product shape and to obtain a highly rigid molded body. Moreover, even if some distribution occurs in the cell shape, cell density, and expansion ratio of the foam layer inside the molded body, a molded body having a good appearance can be obtained due to the smoothness and rigidity of the skin layer.
- the thickness of the solid skin layer is not particularly limited, but is preferably 0.1 to 0.5 mm, more preferably 0.3 to 0.5 mm.
- the thickness of the central foam layer is preferably 2 to 4 mm, more preferably 1.8 to 3.5 mm, and the timing of the core back for forming the skin layer having the above thickness depends on the type of resin, the foaming agent However, when ordinary polypropylene is used, it is preferably about 0 to 3 s, more preferably about 0.5 to 3 s after completion of injection filling. If the time from the completion of injection filling to the core back is too short, a skin layer with sufficient thickness will not be formed, and if it is too long, the resin will solidify and sufficient foaming ratio will not be obtained even if the core is back. .
- the expansion ratio can be appropriately controlled by the resin temperature, injection speed, waiting time from the end of injection filling to the start of core back, core back amount, core back speed, cooling time after the end of core back, etc. 3.0 times is preferable.
- the core back can be performed in several stages, whereby a molded body in which the cell structure and the end shape are controlled is obtained.
- the expansion ratio limited to the foam layer is preferably 2 to 6 times, and more preferably 3 to 5 times.
- a hot runner, a shut-off nozzle, a valve gate, etc. used in normal injection molding can be used.
- Valve gates and hot runners not only suppress the generation of waste resin such as runners, but also prevent the occurrence of defects in foamed molded products in the next cycle by the propylene-based resin composition for foam molding leaking from the mold into the cavity. effective.
- the molding cycle can be shortened by controlling the contact state between the molded product and the mold by slightly clamping, thereby promoting cooling. It is also possible to obtain a molded article having a good dent and cell shape.
- an injection foam molded article having a thickness of about 1.2 to 5.0 mm can be suitably obtained.
- the average cell diameter is about 0.01 to 1.0 mm.
- the cell diameter may be several mm. There may be a part of the communication.
- the injection-foamed molded product of the present invention obtained by the above-described production method is “at right angles to the solid skin layer” in the region of the foamed layer center portion of 10 to 50% in the cross-section of the molded product cut in parallel with the movable mold retreat direction.
- the molded body should have a low thermal conductivity between the front and back sides of the molded body. Can do.
- the expansion ratio is increased, the cells meet together and communicate with each other, and the inside of the molded body becomes hollow.
- the resin pillar is formed in the cavity, the molded body is highly lightweight. And has a strong rigidity.
- foamed molded products can be suitably used for various applications such as automotive interior and exterior parts, cardboard substitutes, electrical appliances, building materials, etc., and particularly suitable for automotive interior parts and automotive exterior parts. Can be used.
- (B) Characteristics of high molecular weight component-containing homopolypropylene (B) Component (i) in high molecular weight component-containing homopolypropylene (propylene having an intrinsic viscosity [ ⁇ ] in tetralin of 13.5 to 20 dl / g at 135 ° C. Homopolymer component) and (ii) component (a propylene homopolymer component having an intrinsic viscosity [ ⁇ ] of 0.5 to 3.0 dl / g in tetralin at 135 ° C.) is continuous during polymerization. It was calculated from the mass balance using the integrated value of the flow meter of propylene supplied to the slab. The intrinsic viscosity [ ⁇ ] of the components (B) and (i) was measured in tetralin at 135 ° C., and the intrinsic viscosity [ ⁇ ] 2 of the component (ii) was a value calculated by the following formula.
- [ ⁇ ] 2 ([ ⁇ ] total ⁇ 100 ⁇ [ ⁇ ] 1 ⁇ W 1 ) / W 2 [ ⁇ ] total: intrinsic viscosity of the entire propylene polymer [ ⁇ ] 1 : intrinsic viscosity of (i) W 1 : weight fraction of (i) (% by weight) W 2 : Weight fraction (wt%) of (ii) [ ⁇ ] was measured at 135 ° C. in a tetralin solvent using a VMR-053 type automatic viscometer manufactured by Kosei Co., Ltd.
- MT Melting tension
- Capillograph 1B manufactured by Toyo Seiki Co., Ltd.
- the load (g) when the strand was taken out was taken as the melt tension (MT 180 ).
- the MFR of the polypropylene resin composition for foam molding was measured by ASTM D-1238 method (230 ° C., load 2.16 kg) without containing a foaming agent.
- MFR 190 MFR measured at 190 ° C.
- MFR 230 MFR measured at 230 ° C.
- the plate thickness ratio t / t 0 is defined as the foaming rate.
- Moldability stability 1.2mm thin moldability by injection molding, load on molding machine due to injection pressure, and thickness of foamed molded product in the middle part between gate and end (see plate thickness measurement position in Fig. 3) The moldability was compared based on the cyclic stability.
- the component (B-1) is a Solvay type titanium trichloride catalyst (manufactured by Tosoh Finechem) based on the polymerization method described in Example 3 described in International Publication No. 2005/097842.
- a prepolymerization catalyst preliminarily polymerized with propylene using together with diethylaluminum chloride was prepared by two-stage polymerization by a propylene polymerization step in the absence of hydrogen and a propylene polymerization step in the presence of hydrogen.
- a foaming agent master batch (Yewa Kasei Kogyo Co., Ltd.) in which an inorganic foaming agent of sodium bicarbonate / sodium citrate is kneaded into low-density polyethylene so that the foaming agent concentration is 30% by weight in the obtained resin composition for injection foaming.
- Polyslene EE25C (Co., Ltd.) was dry blended with 6 parts by weight (so that the concentration as a foaming agent component was 1.8% by weight) with respect to 100 parts by weight of the resin composition, and then injection molded under the above conditions As a result, a foamed molded product was obtained.
- the physical properties of the foamed molded product were evaluated, and the results are shown in Table 1. Moreover, the cross-sectional photograph of the obtained foaming molding is shown in FIG.
- Example 2 A resin composition for foam molding in the same manner as in Example 1, except that the amount of component (A) used was 64 parts by weight and the amount of component (B-1) used was 5 parts by weight. Manufactured. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 1.
- Example 3 A resin composition for foam molding in the same manner as in Example 1, except that the amount of component (A) used was 62 parts by weight and the amount of component (B-1) used was 7 parts by weight. Manufactured. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 1.
- Example 4 A resin composition for foam molding in the same manner as in Example 1, except that the amount of component (A) used was 60 parts by weight and the amount of component (B-1) used was 9 parts by weight. Manufactured. Using the obtained resin composition, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that the amount of the foaming agent master batch was 9 parts by weight with respect to 100 parts by weight of the resin composition. did. The results are shown in Table 1.
- EOR ethylene octene copolymer
- Example 6 In Example 5, the resin composition for foam molding was produced in the same manner as in Example 5 except that the amount of component (A) used was 74 parts by weight and the amount of component (D) used was 1 part by weight. did. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 1.
- Example 7 In Example 6, a resin composition for foam molding was produced in the same manner as in Example 6 except that the amount of component (A) used was 75 parts by weight and that component (D) was not used. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 1.
- Example 8 In Example 1, the amount of component (A) used was 59 parts by weight, the amount of component (B-1) used was 4 parts by weight, and the amount of component (E) used was 6 parts by weight. In the same manner as in Example 1, foamed molded articles were produced and evaluated. The results are shown in Table 1.
- Example 9 In Example 8, the amount of component (A) used was 58 parts by weight, the amount of component (D) used was 4 parts by weight, and the amount of component (E) used was 17 parts by weight. In the same manner as in No. 8, a foam molded article was produced and evaluated. The results are shown in Table 1.
- Example 1 A resin composition for foam molding was produced in the same manner as in Example 1 except that the amount of component (A) used was 69 parts by weight and that component (B-1) was not used. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2. Moreover, the cross-sectional photograph of the obtained foaming molding is shown in FIG.
- a foam molding resin composition was produced.
- a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2.
- Comparative Example 3 In Comparative Example 2, the resin composition for foam molding was the same as Comparative Example 2 except that the amount of component (A) used was 64 parts by weight and the amount of component (B-2) used was 5 parts by weight. The thing was manufactured. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2.
- Comparative Example 4 In Comparative Example 2, the resin composition for foam molding was the same as Comparative Example 2 except that the amount of component (A) used was 60 parts by weight and the amount of component (B-2) used was 9 parts by weight. The thing was manufactured. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2. Moreover, the cross-sectional photograph of the obtained foaming molding is shown in FIG.
- Example 7 a foam molding resin composition was produced in the same manner as in Example 7 except that the amount of component (A) used was 80 parts by weight and that component (B-1) was not used. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2.
- Example 6 A resin composition for foam molding in the same manner as in Example 1, except that the amount of component (A) used was 68 parts by weight and the amount of component (B-1) used was 1 part by weight. Manufactured. Next, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that this was used. The results are shown in Table 2.
- Example 7 A resin composition for foam molding in the same manner as in Example 1, except that the amount of component (A) used was 49 parts by weight and the amount of component (B-1) used was 20 parts by weight. Manufactured. Using the obtained resin composition, a foamed molded article was produced and evaluated in the same manner as in Example 1 except that the amount of the foaming agent master batch was 9 parts by weight with respect to 100 parts by weight of the resin composition. did. The results are shown in Table 2.
- Comparative Example 8 A resin composition for foam molding in the same manner as in Comparative Example 1, except that the amount of component (A) used was 70 parts by weight and the amount of component (C-1) used was 16 parts by weight in Comparative Example 1. Manufactured. Using the obtained resin composition, a foamed molded article was produced and evaluated in the same manner as in Comparative Example 1. The results are shown in Table 2.
- the system was stabilized at an internal temperature of 40 ° C. and a total pressure of 0.78 MPa-G, and then the prepolymerized catalyst component was converted into a solid catalyst.
- the polymerization was started by adding 50 ml of heptane slurry containing 0.75 gram.
- the amount of polymer produced from the propylene flow rate integrated value when propylene was continuously supplied for 10 minutes was 50 g.
- the intrinsic viscosity was 16.2 dl / g.
- the internal temperature was lowered to 30 ° C. or less, stirring was weakened, and depressurization was performed.
- the intrinsic viscosity was 0.98 dl / g
- the MFR was 240 g / 10 min.
- the polypropylene resin composition for foam molding of the present invention can be suitably used for foam molding, particularly injection foam molding.
- the injection-foamed molded article of the present invention can be suitably used for various applications such as automotive interior and exterior parts, substitutes such as cardboard, electrical appliances, building materials, etc., and particularly suitable for automotive interior parts and automotive exterior parts. Can be used.
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Abstract
Description
しかしながら、さらなる軽量化に対応した射出発泡成形体を得るためには、さらに射出発泡成形に適し、流動性および溶融張力がともに高く、射出段階では薄いキャビティに充填可能で、かつ発泡段階では安定した発泡セルを形成可能な樹脂特性を有し、さらに射出発泡成形体として外観や製品剛性、衝撃強度に優れるようなポリプロピレン系樹脂組成物およびその発泡成形体が強く望まれていた。
(AB)高分子量成分含有インパクトポリプロピレン:50~90重量部
(C)ゴム成分:10~30重量部
(D)無機フィラー:0~20重量部
(ただし、(AB)、(C)、(D)の合計を100重量部とする)
からなり、
前記(AB)高分子量成分含有インパクトポリプロピレンの、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が4.5~31.0重量%であり、
(AB)高分子量成分含有インパクトポリプロピレンが、135℃、テトラリン中での極限粘度[η]が13.5~20.0dl/gのプロピレン重合体成分を0.2~3.7重量%含む
ことを特徴としている。
(E)高流動性ホモポリプロピレン:5~20重量部
(ただし、(AB)、(C)、(D)、(E)の合計を100重量部とする)
をさらに含み、
前記(E)高流動性ホモポリプロピレンのASTM D-1238により230℃、2.16kg荷重で測定したMFRが200~1000g/10minである
ことを特徴としている。
(A)インパクトポリプロピレン:45~87重量部
(B)高分子量成分含有ホモポリプロピレン:2~15重量部
(ただし、(A)、(B)、(C)、(D)の合計を100重量部とする)
からなり、
前記(A)インパクトポリプロピレンの、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が5~30重量%であり、前記(B)高分子量成分含有ホモポリプロピレンが、
(i)135℃、テトラリン中での極限粘度[η]が13.5~20dl/gのプロピレン単独重合体成分を5~22重量%含み、
(ii)135℃、テトラリン中での極限粘度[η]が0.5~3.0dl/gのプロピレン単独重合体成分を78~95重量%含む
ことを特徴としている。
(E)高流動性ホモポリプロピレン:5~20重量部
(ただし、(A)、(B)、(C)、(D)、(E)の合計を100重量部とする)
をさらに含み、
前記(E)高流動性ホモポリプロピレンのASTM D-1238により230℃、2.16kg荷重で測定したMFRが200~1000g/10minである
ことを特徴としている。
(A)インパクトポリプロピレンが、
ASTM D-1238により230℃、2.16kg荷重で測定したMFRが50~200g/10minであり、
常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体の極限粘度[η]が3.5~10dl/gの範囲であることが好ましい。
(C)ゴム成分が、エチレンと、炭素数3~10のα-オレフィンとの共重合体であって、ASTM D-1238により190℃、2.16kg荷重で測定したMFRが1~50g/10min、かつ、密度が0.86~0.92g/cm3の範囲であることが好ましく、
(C)ゴム成分が、シングルサイト触媒で製造されたエチレン・α-オレフィン系エラストマーであることがより好ましい。
MT180≦30000×(MFR230)-2 ・・・(2)
40≦MFR230≦120 ・・・(3)
本発明の射出発泡成形体は、上記本発明の発泡成形用ポリプロピレン系樹脂組成物を射出発泡成形してなることを特徴としている。
■:比較例2~4:高分子量成分含有ホモポリプロピレンB-2添加系
×:比較例1,5,8:高分子量成分含有ホモポリプロピレン無添加系
◆:比較例9~11:市販発泡用ポリプロピレン
●:比較例12~15:市販一般ポリプロピレン
本発明の発泡成形用ポリプロピレン系樹脂組成物は、少なくとも、(AB)高分子量成分含有インパクトポリプロピレンおよび(C)ゴム成分を含み、必要に応じて(D)無機フィラーを含有する。また、(AB)高分子量成分含有インパクトポリプロピレンは、(A)インパクトポリプロピレン、(B)高分子量成分含有ホモポリプロピレンに置き換えても本発明において同等の効果を有する。
本発明で用いる(AB)高分子量成分含有インパクトポリプロピレンは、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が4.5~31.0重量%、好ましくは5~30重量%、さらに好ましくは6~28重量%である。
本発明で用いる(A)インパクトポリプロピレンは、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が好ましくは5~30重量%、より好ましくは8~27重量%である。(A)インパクトポリプロピレン中において、プロピレン単独重合体部分および必要に応じて含有されるポリエチレン部分は常温パラキシレンに不溶性であり、プロピレン・エチレンランダム共重合体部分は常温パラキシレンに可溶性である。(A)インパクトポリプロピレン中の常温パラキシレン可溶成分の含有量が上記範囲であると、剛性と耐衝撃性とのバランスに優れるため好ましい。
本発明で用いる(B)高分子量成分含有ホモポリプロピレンは、
(i)135℃、テトラリン中での極限粘度[η]が13.5~20dl/g超のプロピレン単独重合体成分(以下(i)成分)を好ましくは5~22重量%、より好ましくは8~20重量%含み、
(ii)135℃、テトラリン中での極限粘度[η]が0.5~3.0dl/gのプロピレン単独重合体成分(以下(ii)成分)を好ましくは78~95重量%、より好ましくは80~92重量%含む。
(a)四塩化チタンを有機アルミニウム化合物で還元して得られる三塩化チタンをエーテル化合物および電子受容体で処理して得られる固体触媒成分、
(b)有機アルミニウム化合物、
(c)環状エステル化合物。
本発明で用いる(C)ゴム成分としては、前記(AB)高分子量成分含有インパクトポリプロピレン、または、前記(A)インパクトポリプロピレンおよび(B)高分子量成分含有ホモポリプロピレン、との相溶性に優れるゴム成分を制限なく用いることができるが、本発明では、(C)ゴム成分として、エチレンと、炭素数3~10のα-オレフィンとの共重合体を用いるのが好ましい。エチレンと共重合するα-オレフィンとしては、プロピレン、1-ブテン、1-ペンテン、1-ヘキセン、4-メチル-1-ペンテン、3-メチル-1-ペンテン、1-ヘプテン、1-オクテン、1-ノネン、1-デセンなどの炭素数3~10のα-オレフィンが挙げられ、これらの1種または2種以上が用いられる。これらのα-オレフィンのうちでは、1-ブテンおよび1-オクテンが特に好ましい。
本発明で用いることのできる(D)無機フィラーとしては、特に制限されないが、たとえば、重質炭酸カルシウム、軽質炭酸カルシウム、タルク、ガラス繊維、炭酸マグネシウム、マイカ、カオリン、硫酸カルシウム、硫酸バリウム、チタンホワイト、ホワイトカーボン、カーボンブラック、水酸化アルミニウム、水酸化マグネシウムを例示することができる。これらは単独で使用することもできるし、または2種以上を混合して用いることもできる。これらの内では、タルクの使用が最も好ましい。
本発明で用いることのできる(E)高流動性ホモポリプロピレンは、ASTM D-1238により230℃、2.16kg荷重で測定したMFRが好ましくは200~1000g/10min、より好ましくは、220~800g/10min、さらに好ましくは240~700g/10minである。(E)高流動性ホモポリプロピレンのMFRが上記範囲内であると、得られる発泡成形用ポリプロピレン系樹脂組成物のMFRを向上させることができ、ついては、流動性をより向上させることができるため好ましい。
本発明の発泡成形用ポリプロピレン系樹脂組成物は、その目的を損なわない範囲で、必要に応じて各種添加剤を含有してもよい。添加剤としては、核剤、酸化防止剤、塩酸吸収剤、耐熱安定剤、耐候安定剤、光安定剤、紫外線吸収剤、滑剤、帯電防止剤、難燃剤、顔料、染料、分散剤、銅害防止剤、中和剤、可塑剤、架橋剤、過酸化物などの流れ性改良剤、ウェルド強度改良剤、天然油、合成油、ワックス等を挙げることができる。
本発明の発泡成形用ポリプロピレン系樹脂組成物の組成は、(AB)高分子量成分含有インパクトポリプロピレン、(C)ゴム成分および(D)無機フィラーの合計を100重量部とした場合に、(AB)成分:50~90重量部、(C)成分:10~30重量部、(D)成分:0~20重量部の範囲であり、好ましくは、(AB)成分:48~87重量部、(C)成分:10~25重量部、(D)成分:1~20重量部の範囲であり、
より好ましくは、(AB)成分:45~85重量部、(C)成分:10~20重量部、(D)成分:3~18重量部の範囲である。
好ましくは、(A)成分:47~86重量部、(B)成分:3~12重量部、(C)成分:10~25重量部、(D)成分:1~20重量部の範囲であり、
より好ましくは、(A)成分:52~82重量部、(B)成分:3~10重量部、(C)成分:10~20重量部、(D)成分:3~18重量部の範囲である。
MT180≦30000×(MFR230)-2 ・・・(2)
40≦MFR230≦120 ・・・(3)
上記式(1)~(3)の関係は、後記する実施例と比較例の関係から見出されたものであり(図8)、当該関係を満たす発泡成形用ポリプロピレン系樹脂組成物は、特に本発明における(AB)高分子量成分含有インパクトポリプロピレン中の前述したプロピレン重合体成分(X)の極限粘度[η]もしくは、(B)高分子量成分含有ホモポリプロピレンの極限粘度[η]が、それぞれ特定の範囲内にある場合に満たされることが認められる。
MT180≧6500×(MFR230)-2 ・・・(5)
また、上記式(2)は、好ましくは式(6)、より好ましくは式(7)で表される。
MT180≦25000×(MFR230)-2 ・・・(7)
さらに、上記式(3)は、好ましくは式(8)、より好ましくは式(9)で表される。
45≦MFR230≦100 ・・・(9)
発泡成形用ポリプロピレン系樹脂組成物が、上記式(1)~(3)の関係を満たす場合、流動性と溶融張力のバランスが高度に保たれたポリプロピレン樹脂組成物となるため、射出段階では薄いキャビティに充填可能で、かつ発泡段階では安定した発泡セルを高倍率で形成可能な樹脂特性を有する。したがって、当該要件を満たす本願発明にかかる発泡成形用ポリプロピレン系樹脂組成物は、特に射出発泡成形用の樹脂組成物として好適に用いることができる。
本発明の射出発泡成形体の製造方法では、上述した発泡成形用ポリプロピレン系樹脂組成物と、発泡剤とを用いて発泡成形体を製造する。
(1)無機系発泡剤:重炭酸ナトリウム、炭酸ナトリウム、重炭酸アンモニウム、炭酸アンモニウム、亜硝酸アンモニウム
(2)有機系発泡剤:(a)N-ニトロソ化合物:N,N’-ジニトロソテレフタルアミド、N,N’-ジニトロソペンタメチレンテトラミン;(b)アゾ化合物:アゾジカルボンアミド、アゾビスイソブチロニトリル、アゾシクロヘキシルニトリル、アゾジアミノベンゼン、バリウムアゾジカルボキシレート;(c)スルフォニルヒドラジド化合物:ベンゼンスルフォニルヒドラジド、トルエンスルフォニルヒドラジド、p,p’-
オキシビス(ベンゼンスルフェニルヒドラジド)、ジフェニルスルフォン-3,3’-
ジスルフォニルヒドラジド;(d)アジド化合物:カルシウムアジド、4,4’-ジフェニルジスルフォニルアジド、p-トルエンスルフォニルアジド
気体状の発泡剤としては、通常の物理発泡剤であれば特に問題なく、二酸化炭素、窒素、アルゴン、ヘリウム、ネオン、アスタチンなどの不活性ガスが挙げられる。これらの中で、蒸気にする必要が無く、安価で、環境汚染、火災の危険性が極めて少ない二酸化炭素、窒素、アルゴンがもっとも優れている。また、気体状発泡剤は、超臨界状態で用いてもよい。
また、発泡倍率が高くなると、複数のセルは共に会合し連通化し、成形体の内部は中空状態になるが、この空洞中に樹脂の支柱が形成されるため、成形体は、高度に軽量化され、強固な剛性を有する。
以下の実施例および比較例において、射出発泡成形は以下の条件により行った。
・射出成形機 : 宇部興産機械(株)製、MD350S-III型(型締め力350t)
・金型
キャビティサイズ :縦400mm、横200mm、厚さ1.2mm
ゲート:キャビティ中央1点ダイレクトゲート
射出温度 :210℃
金型表面温度 :45℃
射出時間 :1.0s (射出開始から溶融樹脂を射出し終わるまでの時間)
・発泡成形条件
発泡工程終了後の成形型クリアランス:3.0mm
コアバック速度:20mm/s
樹脂充填後の発泡開始遅延時間:0~1s
射出時金型キャビティクリアランス(L0):1.2mm
[測定、評価方法]
実施例および比較例において、樹脂組成物あるいは得られた成形体の各特性は、以下の方法により測定あるいは評価した。
(B)高分子量成分含有ホモポリプロピレン中の(i)成分(135℃、テトラリン中での極限粘度[η]が13.5~20dl/gのプロピレン単独重合体成分)および(ii)成分(135℃、テトラリン中での極限粘度[η]が0.5~3.0dl/gのプロピレン単独重合体成分)の重量分率は、重合時に連続的に供給するプロピレンの流量計積算値を用いた物質収支から求めた。また、(B)および(i)成分の極限粘度[η]の測定は、135℃のテトラリン中で行い、(ii)成分の極限粘度[η]2は、下記式により計算した値とした。
[η]total:プロピレン重合体全体の極限粘度
[η]1:(i)の極限粘度
W1:(i)の重量分率(重量%)
W2:(ii)の重量分率(重量%)
なお、[η]の測定は、(株)離合社のVMR-053型自動粘度計を用い、テトラリン溶媒中135℃において測定した。
溶融張力は、溶融張力測定用アタッチメントを付けたキャピログラフ(東洋精機製 キャピログラフ1B)を使用し、180℃でφ2.095mm、長さ8mmのキャピラリから、押出し速度15mm/min、巻取り速度15m/minでストランドを引き取ったときの荷重(g)を溶融張力(MT180)とした。
ASTM D-1238法に基づき、230℃、荷重2.16kgの条件、または、190℃、荷重2.16kgの条件((C)ゴム成分の場合)で測定した。
ゴム成分の密度は、ISO-1183(JIS K7112)に準じて測定した。
発泡前の板厚をt0、発泡後の成形体の板厚tとするとき、板厚比t/t0を発泡倍率とした。
(1)発泡倍率達成度
2.5倍の発泡倍率が達成したか否かについて、以下の基準で評価した。
A:発泡前の板厚t0=1.2mmのとき、発泡後の成形体の板厚t=3.0mm以上となり、2.5倍の発泡倍率を達成した場合
C:発泡前の板厚t0=1.2mmのとき、発泡後の成形体の板厚t=3.0mm未満となり、2.5倍の発泡倍率が未達成の場合
(2)セル形状
成形品の断面を以下の基準で評価した。
A:破泡の無い独立気泡
B:わずかに破泡による連続気泡あり
C:破泡による連続気泡で発泡層に亀裂あり
(3)平面性
成形体の平面性は成形体を対角線上に切断し、ゲート部から端部の間を4等分したときの分割点3箇所(図4の板厚測定位置参照)の板厚比較を実施して評価した。
A:成形体全面の板厚誤差が±0.2mm未満
B:成形体全面の板厚誤差が±0.2mm以上0.3mm未満
C:成形体全面の板厚誤差が±0.3mm以上
(4)成形性安定性
射出成形による1.2mmの薄肉成形性と射出圧力による成形機への負荷、およびゲートと端部の中間部分における発泡成形体の厚み(図3の板厚測定位置参照)の繰返し安定性により成形性を比較した。
A:成形品にショートショットが発生せず、成形時の射出圧力が射出成形機の最大射出圧力(250MPa)以下、および成形体厚みの繰返し誤差が±0.2mm以下
B:成形品にショートショットが発生せず、成形時の射出圧力が射出成形機の最大射出圧力(250MPa)以下、もしくは成形体厚みの繰返し誤差が±0.2mmを超え0.3mm以下
C:成形品にショートショットが発生、もしくは成形時の射出圧力が射出成形機の最大射出圧力(250MPa)を超える、もしくは成形体厚みの繰返し誤差±0.3mmを超える
[実施例1]
(成分A)MFR230=110g/10min、常温パラキシレン不溶部分(Xinsol)のMFR230=240g/10min、プロピレン単独重合体部分のアイソタクチックペンタッド分率=97.5%、常温パラキシレン可溶部分(Xsol)=12重量%で、常温パラキシレン可溶部分(Xsol)の[η]=4.0dl/gである、チーグラー・ナッタ系触媒を用いて重合したプロピレン・エチレンブロック共重合体:66重量部、
(成分B-1)高分子量ホモポリプロピレン(135℃、テトラリン中での極限粘度[η]1=16dl/gの成分量19重量%、極限粘度[η]2が0.57dl/gの成分量81重量%、[η]total=3.5dl/g):3重量部、
(成分C-1)シングルサイト触媒で製造された、密度=0.87g/cm3、MFR190=35g/10minの低分子量エチレン・1-ブテン共重合体(EBR)(三井化学社製A-35070S):17重量部、および、
(成分D)微粉末タルク(平均粒径:4.1μm):14重量部を混合し、造粒して発泡成形用樹脂組成物を得た。
実施例1において、成分(A)の使用量を64重量部、成分(B-1)の使用量を5重量部としたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例1において、成分(A)の使用量を62重量部、成分(B-1)の使用量を7重量部としたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例1において、成分(A)の使用量を60重量部、成分(B-1)の使用量を9重量部としたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。得られた樹脂組成物を用い、発泡剤マスターバッチの使用量を樹脂組成物100重量部に対して9重量部としたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例1において、成分(A)の使用量を61重量部、成分(B-1)の使用量を5重量部とし、成分(C-1)に代えて成分(C-2):シングルサイト触媒で製造されたMFR190=30g/10min、密度=0.87g/cm3のエチレン・オクテン共重合体(EOR)(The Dow Chemical Company製、ENGAGE8407)20重量部を使用したことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例5において、成分(A)の使用量を74重量部、成分(D)の使用量を1重量部としたことの他は、実施例5と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例6において、成分(A)の使用量を75重量部とし、成分(D)を用いなかったことの他は、実施例6と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例1において、成分(A)の使用量を59重量部、成分(B-1)の使用量を4重量部とし、成分(E)の使用量を6重量部としたことの他は、実施例1と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例8において、成分(A)の使用量を58重量部、成分(D)の使用量を4重量部とし、成分(E)の使用量を17重量部としたことの他は、実施例8と同様にして発泡成形体を製造し、評価した。結果を表1に示す。
実施例1において、成分(A)の使用量を69重量部とし、成分(B-1)を用いなかったことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。また、得られた発泡成形体の断面写真を図6に示す。
実施例1において、成分(A)の使用量を66重量部とし、成分(B-1)に代えて成分(B-2):(135℃、テトラリン中での極限粘度[η]1=8.1dl/gの成分量が22重量%、極限粘度[η]2=1.0dl/gの成分量が78重量%、[η]total=2.6dl/g)を用いたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
比較例2において、成分(A)の使用量を64重量部とし、成分(B-2)の使用量を5重量部としたことの他は、比較例2と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
比較例2において、成分(A)の使用量を60重量部とし、成分(B-2)の使用量を9重量部としたことの他は、比較例2と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。また、得られた発泡成形体の断面写真を図7に示す。
実施例7において、成分(A)の使用量を80重量部とし、成分(B-1)を用いなかったことの他は、実施例7と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
実施例1において、成分(A)の使用量を68重量部、成分(B-1)の使用量を1重量部としたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。次いで、これを用いたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
実施例1において、成分(A)の使用量を49重量部、成分(B-1)の使用量を20重量部としたことの他は、実施例1と同様にして発泡成形用樹脂組成物を製造した。得られた樹脂組成物を用い、発泡剤マスターバッチの使用量を樹脂組成物100重量部に対して9重量部としたことの他は実施例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
比較例1において、成分(A)の使用量を70重量部、成分(C-1)の使用量を16重量部としたことの他は、比較例1と同様にして発泡成形用樹脂組成物を製造した。得られた樹脂組成物を用い、比較例1と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=71の射出発泡用インパクトポリプロピレン((株)プライムポリマー製、TD026S)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=65の射出発泡用インパクトポリプロピレン((株)プライムポリマー製、FX200S)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=44の射出発泡用インパクトポリプロピレン((株)プライムポリマー製、FX800)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=30のインパクトポリプロピレン((株)プライムポリマー製、J830HV)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=40のインパクトポリプロピレン((株)プライムポリマー製、J708UG)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=57のインパクトポリプロピレン((株)プライムポリマー製、J709QG)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
使用する材料を、MFR=60のインパクトポリプロピレン((株)プライムポリマー製、J6083HP)とし、比較例8と同様にして発泡成形体を製造し、評価した。結果を表2に示す。
実施例1~9、比較例6および7:高分子量成分含有ホモポリプロピレンB-1添加系
比較例2~4:高分子量成分含有ホモポリプロピレンB-2添加系
比較例1,5,8:高分子量成分含有ホモポリプロピレン無添加系
比較例9~11:市販発泡用ポリプロピレン
比較例12~15:市販一般ポリプロピレン
[実施例10]
(成分AB)MFR230=110g/10min、常温パラキシレン不溶部分(Xinsol)のMFR230=240g/10minで、常温パラキシレン不溶部分(Xinsol)中に極限粘度[η]=16dl/gの成分を1.9重量%含み、常温パラキシレン可溶部分(Xsol)=11重量%で、常温パラキシレン可溶部分(Xsol)の[η]=4.5dl/g、であるプロピレン・エチレンブロック共重合体:69重量部、
(成分C-1)シングルサイト触媒で製造された、密度=0.87g/cm3、MFR190=35g/10minの低分子量エチレン・1-ブテン共重合体(EBR)(三井化学社製A-35070S):17重量部、および、
(成分D)微粉末タルク(平均粒径:4.1μm):14重量部を混合し、造粒して発泡成形用樹脂組成物にし、実施例1と同様に成形、評価を行った。結果を表3に示す。
(1)予備重合
内容積5リットルの撹拌機付きの三つ口フラスコを十分に乾燥し窒素ガスで置換した後、脱水処理したヘプタンを4リットル、ジエチルアルミニウムクロライド140グラムを加え市販のSolvay型三塩化チタン触媒(東ソー・ファインケム社製)20gを加えた。内温を20℃に保持し、撹拌しながらプロピレンを連続的に導入した。80分後、撹拌を停止し、固体触媒1g当たり0.8gのプロピレンが重合した予備重合触媒成分を得た。
(2)プロピレン/エチレンブロック共重合
(i)プロピレン重合
内容積10リットルの撹拌機付きステンレス製オートクレーブを十分乾燥し窒素ガスで置換した後、脱水処理したヘプタン6リットルを加えた。続いて、1.3ミリモルのε‐カプロラクトンをトルエン溶液として加えた。
次に、内温を57℃として水素を0.01MPa‐G加えて撹拌しながらエチレン/プロピレン混合ガス(エチレン/プロピレンモル比:0.7/1.0)を導入した。全圧0.60MPa‐Gに到達した時点で共重合開始としプロピレン/エチレン混合ガスを連続的に供給した。重合開始1時間経たところで50ミリリットルのメタノールを添加し降温、脱圧した。内容物を全量フィルター付きろ過槽へ移し1-ブタノール100ミリリットルを加え、60℃で1時間撹拌した後に固液分離した。さらに、60℃のヘプタン6リットルで固体部を2回洗浄し、真空乾燥してプロピレン重合体3.0kgを得た。
2 可動型
3 キャビティ
4 バルブゲート
5 射出成形機ノズル
6 溶融樹脂
Claims (14)
- (AB)高分子量成分含有インパクトポリプロピレン:50~90重量部
(C)ゴム成分:10~30重量部
(D)無機フィラー:0~20重量部
(ただし、(AB)、(C)、(D)の合計を100重量部とする)
からなり、
前記(AB)高分子量成分含有インパクトポリプロピレンの、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が4.5~31.0重量%であり、
(AB)高分子量成分含有インパクトポリプロピレンが、135℃、テトラリン中での極限粘度[η]が13.5~20.0dl/gのプロピレン重合体成分を0.2~3.7重量%含む
ことを特徴とする発泡成形用ポリプロピレン系樹脂組成物。 - 前記(AB)、(C)、(D)に加えて、
(E)高流動性ホモポリプロピレン:5~20重量部
(ただし、(AB)、(C)、(D)、(E)の合計を100重量部とする)
をさらに含み、
前記(E)高流動性ホモポリプロピレンのASTM D-1238により230℃、2.16kg荷重で測定したMFRが200~1000g/10minである、
請求項1に記載の発泡成形用ポリプロピレン系樹脂組成物。 - 前記(AB)高分子量成分含有インパクトポリプロピレンが、
(A)インパクトポリプロピレン:45~87重量部
(B)高分子量成分含有ホモポリプロピレン:2~15重量部
(ただし、(A)、(B)、(C)、(D)の合計を100重量部とする)
からなり、
前記(A)インパクトポリプロピレンの、常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体量が5~30重量%であり、
前記(B)高分子量成分含有ホモポリプロピレンが、
(i)135℃、テトラリン中での極限粘度[η]が13.5~20.0dl/gのプロピレン単独重合体成分を5~22重量%含み、
(ii)135℃、テトラリン中での極限粘度[η]が0.5~3.0dl/gのプロピレン単独重合体成分を78~95重量%含む
ことを特徴とする発泡成形用ポリプロピレン系樹脂組成物。 - 前記(A)、(B)、(C)、(D)に加えて、
(E)高流動性ホモポリプロピレン:5~20重量部
(ただし、(A)、(B)、(C)、(D)、(E)の合計を100重量部とする)
をさらに含み、
前記(E)高流動性ホモポリプロピレンのASTM D-1238により230℃、2.16kg荷重で測定したMFRが200~1000g/10minである、
請求項3に記載の発泡成形用ポリプロピレン系樹脂組成物。 - インパクトポリプロピレン(A)が、
ASTM D-1238により230℃、2.16kg荷重で測定したMFRが50~200g/10minであり、
常温パラキシレン可溶成分として特定されるプロピレン・エチレン共重合体の極限粘度[η]が3.5~10dl/gの範囲であることを特徴とする請求項3または4に記載の発泡成形用ポリプロピレン系樹脂組成物。 - ゴム成分(C)が、エチレンと、炭素数3~10のα-オレフィンとの共重合体であって、ASTM D-1238により190℃、2.16kg荷重で測定したMFRが1~50g/10min、かつ、密度が0.86~0.92g/cm3の範囲であることを特徴とする請求項1~5のいずれか1項に記載の発泡成形用ポリプロピレン系樹脂組成物。
- ゴム成分(C)が、シングルサイト触媒で製造されたエチレン・α-オレフィン系エラストマーであることを特徴とする請求項6に記載の発泡成形用ポリプロピレン系樹脂組成物。
- 前記発泡成形用ポリプロピレン系樹脂組成物の、ASTM D-1238により230℃、2.16kg荷重で測定したMFR230が、30~200g/10minである請求項1~7のいずれか1項に記載の発泡成形用ポリプロピレン系樹脂組成物。
- 前記発泡成形用ポリプロピレン系樹脂組成物の、ASTM D-1238により230℃、2.16kg荷重で測定したMFR230と、溶融張力MT180が、下記式(1)~(3)の関係にある、請求項1~7のいずれか1項に記載の射出発泡成形用ポリプロピレン系樹脂組成物。
MT180≧5500×(MFR230)-2 ・・・(1)
MT180≦30000×(MFR230)-2 ・・・(2)
40≦MFR230≦120 ・・・(3) - 請求項1~9のいずれか1項に記載の発泡成形用ポリプロピレン系樹脂組成物を射出発泡成形してなる射出発泡成形体。
- 化学発泡剤および/または物理発泡剤を用いて射出発泡成形してなる請求項10に記載の射出発泡成形体。
- 射出開始時の金型キャビティクリアランス(T0)が1.0~2.0mmであり、T0と可動型後退後のキャビティの断面の拡開方向長さ(T1)との比(T1/T0)が1.1~5.0である請求項10または11に記載の射出発泡成形方法。
- 射出発泡成形体がソリッドスキン層に挟まれて中心に発泡層を配し、成形体表面のソリッドスキン層が片側0.1~0.5mm、発泡層が2~4mmであり、発泡層の発泡倍率が2~6倍である発泡成形品であって、可動型後退方向と平行に切断した成形体断面において、発泡層中心部10~50%の領域で、「ソリッドスキン層に直角のセル直径/ソリッドスキン層に沿ったセル直径」の比が0.7~1.4であるセルを70%以上含み、残りの発泡層のセルにおいては、「ソリッドスキン層に直角のセル直径/ソリッドスキン層に沿ったセル直径」の比が0.1~0.9であるセルを60%以上含む請求項10または11に記載の射出発泡成形体
- 自動車内外装用部品であることを特徴とする請求項10~13のいずれか1項に記載の射出発泡成形体。
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CN2009801389283A CN102171280B (zh) | 2008-10-31 | 2009-10-28 | 发泡成型用聚丙烯类树脂组合物及使用该组合物得到的发泡成型体 |
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JP2011207203A (ja) * | 2010-03-09 | 2011-10-20 | Sekisui Chem Co Ltd | 射出発泡成形材料及び射出発泡成形品 |
WO2021049585A1 (ja) | 2019-09-13 | 2021-03-18 | 株式会社プライムポリマー | ポリプロピレン系樹脂組成物及びそれを含む成形体 |
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