WO2014185371A1 - 発泡成形体用ポリアミド樹脂組成物、及びそれからなるポリアミド樹脂発泡成形体 - Google Patents
発泡成形体用ポリアミド樹脂組成物、及びそれからなるポリアミド樹脂発泡成形体 Download PDFInfo
- Publication number
- WO2014185371A1 WO2014185371A1 PCT/JP2014/062564 JP2014062564W WO2014185371A1 WO 2014185371 A1 WO2014185371 A1 WO 2014185371A1 JP 2014062564 W JP2014062564 W JP 2014062564W WO 2014185371 A1 WO2014185371 A1 WO 2014185371A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyamide resin
- resin composition
- foam molded
- polyamide
- mass
- Prior art date
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- 229920006122 polyamide resin Polymers 0.000 title claims abstract description 85
- 239000006260 foam Substances 0.000 title claims abstract description 65
- 239000011342 resin composition Substances 0.000 title claims abstract description 57
- 229920005989 resin Polymers 0.000 claims abstract description 63
- 239000011347 resin Substances 0.000 claims abstract description 63
- 239000004952 Polyamide Substances 0.000 claims abstract description 53
- 229920002647 polyamide Polymers 0.000 claims abstract description 53
- 239000006229 carbon black Substances 0.000 claims abstract description 50
- 229920006039 crystalline polyamide Polymers 0.000 claims abstract description 36
- 238000002425 crystallisation Methods 0.000 claims abstract description 26
- 230000008025 crystallization Effects 0.000 claims abstract description 26
- 239000012779 reinforcing material Substances 0.000 claims abstract description 17
- 238000002844 melting Methods 0.000 claims abstract description 12
- 230000008018 melting Effects 0.000 claims abstract description 12
- 230000001737 promoting effect Effects 0.000 claims abstract description 7
- 238000005187 foaming Methods 0.000 claims description 21
- 239000004088 foaming agent Substances 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 8
- 239000000049 pigment Substances 0.000 claims description 7
- 239000004953 Aliphatic polyamide Substances 0.000 claims description 3
- 229920003231 aliphatic polyamide Polymers 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract 1
- -1 polypropylene Polymers 0.000 description 61
- 238000000034 method Methods 0.000 description 40
- 239000010410 layer Substances 0.000 description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 27
- 229920001577 copolymer Polymers 0.000 description 23
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 22
- 210000004027 cell Anatomy 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 15
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 13
- 239000003365 glass fiber Substances 0.000 description 12
- 238000000465 moulding Methods 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 239000004594 Masterbatch (MB) Substances 0.000 description 10
- 229920002292 Nylon 6 Polymers 0.000 description 10
- 239000007822 coupling agent Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 230000005484 gravity Effects 0.000 description 10
- 229920000098 polyolefin Polymers 0.000 description 10
- 239000005977 Ethylene Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 9
- 239000000523 sample Substances 0.000 description 9
- 229920005992 thermoplastic resin Polymers 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 238000010097 foam moulding Methods 0.000 description 8
- 238000001746 injection moulding Methods 0.000 description 8
- 229920000573 polyethylene Polymers 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000003963 antioxidant agent Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 7
- 239000000835 fiber Substances 0.000 description 7
- 239000003063 flame retardant Substances 0.000 description 7
- 239000011521 glass Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000005749 Copper compound Substances 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 150000001880 copper compounds Chemical class 0.000 description 6
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 229920001155 polypropylene Polymers 0.000 description 6
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 6
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 6
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 5
- GVNWZKBFMFUVNX-UHFFFAOYSA-N Adipamide Chemical compound NC(=O)CCCCC(N)=O GVNWZKBFMFUVNX-UHFFFAOYSA-N 0.000 description 5
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 150000001412 amines Chemical class 0.000 description 5
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000011156 evaluation Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000011261 inert gas Substances 0.000 description 5
- 229920001684 low density polyethylene Polymers 0.000 description 5
- 239000004702 low-density polyethylene Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 239000003381 stabilizer Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000013585 weight reducing agent Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 4
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 4
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 4
- 150000001244 carboxylic acid anhydrides Chemical group 0.000 description 4
- 125000002843 carboxylic acid group Chemical group 0.000 description 4
- 150000004985 diamines Chemical class 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 229920006020 amorphous polyamide Polymers 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 238000004040 coloring Methods 0.000 description 3
- 238000007334 copolymerization reaction Methods 0.000 description 3
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- ILRSCQWREDREME-UHFFFAOYSA-N dodecanamide Chemical compound CCCCCCCCCCCC(N)=O ILRSCQWREDREME-UHFFFAOYSA-N 0.000 description 3
- 125000000524 functional group Chemical group 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 description 3
- 238000006068 polycondensation reaction Methods 0.000 description 3
- 229920001955 polyphenylene ether Polymers 0.000 description 3
- 230000009257 reactivity Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- HQHCYKULIHKCEB-UHFFFAOYSA-N tetradecanedioic acid Natural products OC(=O)CCCCCCCCCCCCC(O)=O HQHCYKULIHKCEB-UHFFFAOYSA-N 0.000 description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- PBLZLIFKVPJDCO-UHFFFAOYSA-N 12-aminododecanoic acid Chemical compound NCCCCCCCCCCCC(O)=O PBLZLIFKVPJDCO-UHFFFAOYSA-N 0.000 description 2
- ULQISTXYYBZJSJ-UHFFFAOYSA-N 12-hydroxyoctadecanoic acid Chemical compound CCCCCCC(O)CCCCCCCCCCC(O)=O ULQISTXYYBZJSJ-UHFFFAOYSA-N 0.000 description 2
- SDJHPPZKZZWAKF-UHFFFAOYSA-N 2,3-dimethylbuta-1,3-diene Chemical compound CC(=C)C(C)=C SDJHPPZKZZWAKF-UHFFFAOYSA-N 0.000 description 2
- AATYZZMKXORGOA-UHFFFAOYSA-N 4-methylheptan-3-amine Chemical compound CCCC(C)C(N)CC AATYZZMKXORGOA-UHFFFAOYSA-N 0.000 description 2
- QNVNLUSHGRBCLO-UHFFFAOYSA-N 5-hydroxybenzene-1,3-dicarboxylic acid Chemical compound OC(=O)C1=CC(O)=CC(C(O)=O)=C1 QNVNLUSHGRBCLO-UHFFFAOYSA-N 0.000 description 2
- PAYRUJLWNCNPSJ-UHFFFAOYSA-N Aniline Chemical compound NC1=CC=CC=C1 PAYRUJLWNCNPSJ-UHFFFAOYSA-N 0.000 description 2
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 2
- QUSNBJAOOMFDIB-UHFFFAOYSA-N Ethylamine Chemical compound CCN QUSNBJAOOMFDIB-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- 239000004705 High-molecular-weight polyethylene Substances 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229920000106 Liquid crystal polymer Polymers 0.000 description 2
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 2
- 229920002302 Nylon 6,6 Polymers 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 2
- LGRFSURHDFAFJT-UHFFFAOYSA-N Phthalic anhydride Natural products C1=CC=C2C(=O)OC(=O)C2=C1 LGRFSURHDFAFJT-UHFFFAOYSA-N 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000004697 Polyetherimide Substances 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 150000008065 acid anhydrides Chemical class 0.000 description 2
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 229910001508 alkali metal halide Inorganic materials 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- OJMOMXZKOWKUTA-UHFFFAOYSA-N aluminum;borate Chemical compound [Al+3].[O-]B([O-])[O-] OJMOMXZKOWKUTA-UHFFFAOYSA-N 0.000 description 2
- LJCFOYOSGPHIOO-UHFFFAOYSA-N antimony pentoxide Chemical compound O=[Sb](=O)O[Sb](=O)=O LJCFOYOSGPHIOO-UHFFFAOYSA-N 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical class C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 2
- HQABUPZFAYXKJW-UHFFFAOYSA-N butan-1-amine Chemical compound CCCCN HQABUPZFAYXKJW-UHFFFAOYSA-N 0.000 description 2
- JHIWVOJDXOSYLW-UHFFFAOYSA-N butyl 2,2-difluorocyclopropane-1-carboxylate Chemical compound CCCCOC(=O)C1CC1(F)F JHIWVOJDXOSYLW-UHFFFAOYSA-N 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 150000001735 carboxylic acids Chemical class 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 2
- QTMDXZNDVAMKGV-UHFFFAOYSA-L copper(ii) bromide Chemical compound [Cu+2].[Br-].[Br-] QTMDXZNDVAMKGV-UHFFFAOYSA-L 0.000 description 2
- GBRBMTNGQBKBQE-UHFFFAOYSA-L copper;diiodide Chemical compound I[Cu]I GBRBMTNGQBKBQE-UHFFFAOYSA-L 0.000 description 2
- PAFZNILMFXTMIY-UHFFFAOYSA-N cyclohexylamine Chemical compound NC1CCCCC1 PAFZNILMFXTMIY-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 description 2
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical compound C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 2
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 2
- UKMSUNONTOPOIO-UHFFFAOYSA-N docosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCC(O)=O UKMSUNONTOPOIO-UHFFFAOYSA-N 0.000 description 2
- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
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- 238000005227 gel permeation chromatography Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 150000004820 halides Chemical class 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- IPCSVZSSVZVIGE-UHFFFAOYSA-N hexadecanoic acid Chemical compound CCCCCCCCCCCCCCCC(O)=O IPCSVZSSVZVIGE-UHFFFAOYSA-N 0.000 description 2
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- KQNPFQTWMSNSAP-UHFFFAOYSA-N isobutyric acid Chemical compound CC(C)C(O)=O KQNPFQTWMSNSAP-UHFFFAOYSA-N 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- 150000003951 lactams Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 2
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 description 2
- HSZCZNFXUDYRKD-UHFFFAOYSA-M lithium iodide Chemical compound [Li+].[I-] HSZCZNFXUDYRKD-UHFFFAOYSA-M 0.000 description 2
- 150000004668 long chain fatty acids Chemical class 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000006082 mold release agent Substances 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 2
- UTOPWMOLSKOLTQ-UHFFFAOYSA-N octacosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCCCCCCCCCC(O)=O UTOPWMOLSKOLTQ-UHFFFAOYSA-N 0.000 description 2
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- 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
- C08J2201/00—Foams characterised by the foaming process
- C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
- C08J2201/03—Extrusion of the foamable blend
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- 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
- C08J2203/06—CO2, N2 or noble gases
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- 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
- C08J2203/08—Supercritical fluid
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- 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
- C08J2207/00—Foams characterised by their intended use
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- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- 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
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
Definitions
- the present invention provides a polyamide foam molded article having an excellent molding appearance with an easy molding method, without impairing the excellent physical properties and heat resistance of the polyamide resin, and having a good molded appearance.
- the present invention relates to a polyamide resin composition for foamed molded articles that makes it possible to provide automobile parts having characteristics.
- a method for producing a polyamide foam using a chemical foaming agent is generally known.
- the chemical foaming method is a method in which foaming molding is performed by mixing a raw material resin and an organic foaming agent that decomposes at a molding temperature and generates a gas, and heating it to a temperature higher than the decomposition temperature of the foaming agent.
- a polyamide terpolymer is used and a polyamide foam having a specific gravity of 1.2 is adjusted by chemical foaming.
- the foaming ratio is low and weight reduction cannot be achieved sufficiently.
- Patent Document 2 as a method for preparing a foam other than chemical foaming, a polyamide molded body having a double expansion ratio is obtained by absorbing carbon dioxide in a polyamide molded body in advance and heating in a subsequent process.
- Patent Document 3 discloses a method for preparing a foamed polyamide molded article in which a supercritical fluid of nitrogen or carbon dioxide is dissolved in a molten resin and injection molded.
- the foaming ratio is as low as 1.25 and sufficient weight reduction is disclosed. Cannot be realized.
- Patent Document 4 a fine foam molded article having an average cell diameter is obtained, but the equipment is complicated in order to obtain the desired foam molded article.
- a special injection plunger and a special injection device are separately required in order to obtain a desired foamed molding.
- the examples are limited to polystyrene resins that are relatively easy to foam even in existing foam molding, and it is not possible to easily obtain a good foam molding with polyamide.
- Patent Document 5 similarly discloses a method for adjusting a foamed molded article using an inert gas in a critical state.
- the black pigment promotes crystallization and accelerates solidification, so that the appearance of the foam molded product is remarkably deteriorated.
- the growth of the foamed layer is hindered, and a uniform foamed layer cannot be obtained.
- the present invention not only provides a polyamide foam molded article having a higher expansion ratio, but also can obtain a uniform foam structure and a good black surface appearance despite a high expansion ratio, and a uniform foam layer. Therefore, it is possible to easily provide a black polyamide foam molded article having useful characteristics of a foam-molded article having heat resistance, heat insulation characteristics, and good vibration resistance characteristics.
- the present inventor adjusts the molten state in the mold by selecting a black pigment that does not promote crystallization in the black pigment added to the polyamide resin. Injecting and filling supercritical inert gas with molten resin, and immediately expanding the cavity by retreating the core of the mold immediately after injection molding, adjusting to the appropriate melt viscosity, uniform foaming Found to get structure. It has also been found that as a result of not being promoted for crystallization, the solidification rate becomes slow, and a good appearance can be obtained even in a non-foamed skin layer that is not pressurized due to the cavity expansion process.
- Crystalline polyamide resin (A), carbon black (B) and inorganic reinforcing material (C) which do not show crystallization promoting action on the crystalline polyamide resin, (A), (B) and (C ) Is a polyamide resin composition containing (A) and (B) in a proportion of 60 to 90 mass% and (C) in a proportion of 10 to 40 mass%, A polyamide resin composition for foam molded articles, wherein the polyamide resin composition satisfies the following characteristic (a): Characteristic (A): XY ⁇ 37 ° C.
- the polyamide resin composition for foamed molded products according to any one of the above (1) to (4) is melted, and a chemical foaming agent and / or in a cavity formed by a plurality of molds clamped
- the polyamide resin composition in a molten state is injected and filled together with an inert gas in a supercritical state, and at least one core side mold is formed at a stage where a non-foamed skin layer is formed by an external pressure of injection and a foaming pressure from the inside.
- a polyamide resin foam molded article obtained by moving in the opening direction and expanding the volume of the cavity to the volume of the foam molded article.
- the good appearance black polyamide foam molded article obtained by the present invention is not only a lightweight and high mechanical property polyamide resin structure, but also has a uniform foamed state and a good surface appearance despite a high foaming ratio, Since heat insulation and vibration resistance, which are useful properties of foam molded products, are added, we provide heat insulating polyamide foam molded products that can be applied to resin functional parts with high required characteristics and design parts that require functionality. can do.
- FIG. 1 is an example (Example 1) of a cross section of a polyamide resin foam molded body of the present invention.
- FIG. 2 is a schematic configuration diagram showing a method for producing a polyamide resin foam molded article of the present invention.
- the crystalline polyamide resin (A) used in the present invention is a polyamide resin obtained by polycondensation of lactam, ⁇ -aminocarboxylic acid, dicarboxylic acid, diamine, etc., or a copolymer or blend thereof. It is.
- the amine component includes 1,2-ethylenediamine, 1,3-trimethylenediamine, 1,4-tetramethylenediamine, 1,5-pentamethylenediamine, 2-methyl-1,5-pentamethylenediamine.
- the following polyvalent carboxylic acids or acid anhydrides can be used as the acid component of the polyamide.
- the polyvalent carboxylic acid include terephthalic acid, isophthalic acid, orthophthalic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,4′-diphenyldicarboxylic acid, and 2,2′-diphenyl.
- Aromatic dicarboxylic acids such as dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 5-sulfonic acid sodium isophthalic acid, 5-hydroxyisophthalic acid, fumaric acid, maleic acid, succinic acid, itaconic acid, adipic acid, azelaic acid, Sebacic acid, 1,11-undecanedioic acid, 1,12-dodecanedioic acid, 1,14-tetradecanedioic acid, 1,18-octadecanedioic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexane Carboxylic acids, such as aliphatic or alicyclic dicarboxylic acids such as dimer acid.
- lactams such as ⁇ -caprolactam and aminocarboxylic acids, undecane lactams, lauryl lactams which are ring-opened structures thereof, 11-aminoundecanoic acid, 12-aminododecanoic acid which are ring-opened structures thereof, and the like can be mentioned.
- Polyamides polymerized from these components include polycaproamide (polyamide 6), polyundecamide (polyamide 11), polylauramide (polyamide 12), polytetramethylene adipamide (polyamide 46), polyhexamethylene adipamide ( Polyamide 66), polyundecamethylene adipamide (polyamide 116), polymetaxylylene adipamide (polyamide MXD6), polyparaxylylene adipamide (polyamide PXD6), polytetramethylene sebacamide (polyamide 410) , Polyhexamethylene sebamide (polyamide 610), polydecamethylene adipamide (polyamide 106), polydecamethylene sebamide (polyamide 1010), polyhexamethylene dodecamide (polyamide 612), polydecamethylene dodecamide ( Polyamide 1012), polyhexamethylene isophthalamide (polyamide 6I), polytetramethylene terephthalamide (polyamide 4T), polypent
- the matrix polyamide resin of the polyamide resin composition used in the present invention is preferably a crystalline polyamide resin, and more preferably an aliphatic polyamide resin. More preferred is polyamide 6.
- the crystallization rate of polyamide 6 can be evaluated using the DSC temperature drop crystallization temperature (Tc2) as an index, and Tc2 of polyamide 6 immediately after polymerization at 10 ° C./min is 179 to 175 ° C.
- Tc2 of the kneaded pellet rises to around 188 to 190 ° C.
- Tc2 when adding a furnace type carbon black generally used as a general-purpose carbon black is 191 to 194 ° C. or higher and cannot be adjusted to 190 ° C. or lower.
- a preferable Tc2 of the resin composition used in the present invention is in the range of 185 to 189 ° C. under a temperature drop condition of 10 ° C./min, and more preferably 182 under a temperature drop condition of 20 ° C./min. The range is ⁇ 186 ° C.
- the relative viscosity (RV) measured at 20 ° C. in 96% concentrated sulfuric acid of the crystalline polyamide resin (A) used in the present invention is preferably 1.5 to 2.8, more preferably 1.6 to 2. .7, more preferably 1.6 to 2.5.
- Examples of a method for setting the relative viscosity of the polyamide within a certain range include a means for adjusting the molecular weight. Polyamides having a relative viscosity of less than 1.5 have good fluidity, but physical properties are poor, and polyamides having a relative viscosity of more than 2.8 are not preferable because they are difficult to flow particularly in thin molding of 2.0 mm or less.
- the crystalline polyamide resin (A) used in the present invention is prepared by adjusting the molar ratio between the amino group and the carboxyl group to perform polycondensation or adding a terminal blocking agent. Can be adjusted.
- the timing for adding the end-capping agent may be at the time of raw material charging, at the start of polymerization, at the end of polymerization, or at the end of polymerization.
- the end capping agent is not particularly limited as long as it is a monofunctional compound having reactivity with the amino group or carboxyl group at the end of the polyamide, but acid anhydrides such as monocarboxylic acid or monoamine, phthalic anhydride, Monoisocyanates, monoacid halides, monoesters, monoalcohols and the like can be used.
- end capping agent examples include aliphatic monoacids such as acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, caprylic acid, lauric acid, tridecanoic acid, myristic acid, palmitic acid, stearic acid, pivalic acid, and isobutyric acid.
- Alicyclic monocarboxylic acids such as carboxylic acid and cyclohexanecarboxylic acid, benzoic acid, toluic acid, ⁇ -naphthalenecarboxylic acid, ⁇ -naphthalenecarboxylic acid, methylnaphthalenecarboxylic acid, aromatic monocarboxylic acid such as phenylacetic acid, maleic anhydride Acids, acid anhydrides such as phthalic anhydride, hexahydrophthalic anhydride, methylamine, ethylamine, propylamine, butylamine, hexylamine, octylamine, decylamine, stearylamine, dimethylamine, diethylamine, dipropylamine, dibutylamine Aliphatic monoamines, Examples thereof include alicyclic monoamines such as cyclohexylamine and dicyclohexylamine, and aromatic monoamines such as aniline, toluidine, diphenyl
- the acid value and amine value of the crystalline polyamide resin (A) used in the present invention are preferably 0 to 200 eq / ton and 0 to 100 eq / ton, respectively.
- the terminal functional group exceeds 200 eq / ton, not only gelation and deterioration are promoted at the time of melt residence, but also problems such as coloring and hydrolysis may be caused even in the use environment.
- the acid value and / or amine value is preferably 5 to 100 eq / ton in accordance with the reactivity and the reactive group.
- Carbon black (B) (hereinafter sometimes referred to as special carbon black) that does not exhibit crystallization promoting action on the crystalline polyamide resin (A) used in the present invention was obtained by melt-kneading both. It does not increase the Tc2 of the polyamide resin composition. Specifically, Tc2 measured under a temperature drop condition of 10 ° C./min in DSC evaluation for a pellet (polyamide resin composition) obtained by adding carbon black (B) to polyamide 6 during melt kneading is 185. Carbon black that reaches ⁇ 190 ° C. is preferred. Further, carbon black in which Tc2 measured under a temperature drop condition of 20 ° C./min in DSC evaluation is 182 to 186 ° C. is more preferable.
- the polyamide resin composition used in the present invention has the following characteristics ( It is most desirable to satisfy (b). Characteristic (A): XY ⁇ 37 ° C.
- the carbon black (B) that does not exhibit crystallization promoting action on the polyamide resin used in the present invention is a black pigment that does not promote crystallization of polyamide even when carbon black (B) is added in an amount of 0.1% by mass or more.
- furnace black Generally used carbon black is furnace black, and carbon black species generally have the following description for the production method.
- Carbon black produced by the mainstream furnace method is called “Furness Black” and is distinguished from carbon black produced by other methods.
- Furnace Black-The furnace method is a method in which petroleum-based or coal-based oil is blown into a high-temperature gas as a raw material, and carbon black is obtained by incomplete combustion. It can be controlled in a wide range of structures and is the most commonly used method for the production of carbon black for various applications, from rubber reinforcement to coloring.
- channel black-channel method mainly using natural gas as a raw material, a flame that incompletely burns is brought into contact with channel steel (H-type steel) to deposit carbon black, which is then scraped and collected.
- the furnace method has become the mainstream as a mass production process due to problems in terms of yield and environment.
- the acetylene black-acetylene method is a method for obtaining carbon black by thermal decomposition of acetylene gas. Carbon black having a high structure and high crystallinity is obtained, and is mainly used as a conductivity imparting agent.
- Oil Smoke Black (Lamp Black) is a method that continues from the BC era by collecting carbon black as soot from smoke generated when oil or pine is sown, and is not suitable for mass production, but has a unique color tone It is used as a raw material for solid black ink because it has carbon black.
- the carbon black (B) used in the present invention that does not increase the Tc2 of the polyamide resin composition in the injection molding process of the polyamide resin composition added by melt-kneading is preferably carbon black that is not produced by the furnace method. More preferred is carbon black which is not produced by the furnace method or the oil smoke method.
- Nigrosine pigments are black and are disclosed in several patents and literatures for reducing the crystallization speed, but this is not preferable from the viewpoint of Tc2 control performance and price for bleed and target colors.
- Examples of carbon black (B) that does not show crystallization promoting action on the crystalline polyamide resin used in the present invention include “EPC840 manufactured by Sumika Color Co., Ltd.” (master base: LDPE resin), “PEC-TT1617 manufactured by Resino Color Co., Ltd.” (Master base: LDPE resin) is commercially available as a carbon black masterbatch and can be used.
- the content of carbon black (B) is preferably from 0.1 to 10.0% by mass, and preferably from 0.2 to 5%, based on the total of crystalline polyamide resin (A) and carbon black (B).
- 0.0 mass% is more preferable, 0.5 to 4.0 mass% is further more preferable, and 1.0 to 3.0 mass% is particularly preferable.
- the amount of carbon black (B) added is less than 0.1% by mass, the black concealing property is not sufficient, and when it exceeds 10% by mass, the mechanical properties are deteriorated.
- a fibrous inorganic reinforcing material as the inorganic reinforcing material (C) used in the present invention is the one that most effectively improves physical properties such as strength, rigidity and heat resistance.
- glass fiber, carbon fiber, aramid Fibers such as fibers, alumina fibers, silicon carbide fibers, zirconia fibers, whiskers such as aluminum borate and potassium titanate, acicular wollastonite, milled fibres, etc. It is not something.
- glass fibers, carbon fibers and the like are particularly preferably used.
- fibrous reinforcing materials are preferably pretreated with a coupling agent such as an organosilane compound, an organotitanium compound, an organoborane compound, and an epoxy compound, and a carboxylic acid group or / and a carboxylic acid. Those that are easily reactive with anhydride groups are particularly preferred.
- a polyamide-based resin composition containing glass fibers treated with a coupling agent is preferable because a molded product having excellent mechanical characteristics and appearance characteristics can be obtained.
- other fibrous reinforcing materials can be added after use if the coupling agent is not yet treated.
- As the glass fiber a chopped strand having a fiber length of about 1 to 20 mm can be preferably used.
- Non-circular cross-section glass fibers include those that are substantially elliptical, substantially oval, or substantially bowl-shaped in a cross section perpendicular to the length direction of the fiber length, and have a flatness of 1.5 to 8 It is preferable that Here, the flatness is assumed to be a rectangle with the smallest area circumscribing a cross section perpendicular to the longitudinal direction of the glass fiber, the length of the long side of the rectangle is the major axis, and the length of the short side is the minor axis. It is the ratio of major axis / minor axis.
- the thickness of the glass fiber is not particularly limited, but the minor axis is about 1 to 20 ⁇ m and the major axis is about 2 to 100 ⁇ m.
- the addition amount of the reinforcing material may be an optimal amount, but when the total of the crystalline polyamide resin (A), carbon black (B) and inorganic reinforcing material (C) is 100% by mass, (A) and It is possible to add them in such amounts that the total of (B) is 60 to 90% by mass and (C) is 10 to 40% by mass. When the blending amount of (C) exceeds 40% by mass, the amount of matrix resin is small.
- the blending amount of (C) is preferably 12 to 38% by mass, and more preferably 15 to 35% by mass.
- the polyamide resin composition of the present invention includes (C) glass beads, glass flakes, glass balloons, silica, talc, kaolin, wollastonite, mica, alumina, hydrotala in addition to the above-mentioned fibrous reinforcing material.
- Site montmorillonite, graphite, carbon nanotube, fullerene, zinc oxide, indium oxide, tin oxide, iron oxide, titanium oxide, magnesium oxide, aluminum hydroxide, magnesium hydroxide, red phosphorus, calcium carbonate, potassium titanate, zirconate titanate
- Examples thereof include lead oxide, barium titanate, aluminum nitride, boron nitride, zinc borate, aluminum borate, barium sulfate, magnesium sulfate, and layered silicate subjected to organic treatment for delamination.
- These fillers may be used not only alone but also in combination of several kinds.
- the addition amount of the filler may be an optimal amount, but when the total of the crystalline polyamide resin (A), the carbon black (B) and the inorganic reinforcing material (C) is 100% by mass, (A) and It is possible to add them in such amounts that the total of (B) is 60 to 90% by mass and (C) is 10 to 40% by mass.
- the blending amount of (C) is preferably 12 to 38% by mass, and more preferably 15 to 35% by mass.
- the fibrous reinforcing material and the filler are preferably used in combination with a coupling agent-treated or coupling agent.
- a silane coupling agent is used as the coupling agent. Any of titanate coupling agents and aluminum coupling agents may be used, and among them, aminosilane coupling agents and epoxysilane coupling agents are particularly preferable.
- an olefin polymer having a carboxylic acid group or / and a carboxylic acid anhydride group may be added in order to impart impact resistance to the polyamide.
- This is an ⁇ -olefin polymer or copolymer in which a monomer having a carboxylic acid group or / and a carboxylic acid anhydride group is contained in a polymer molecular chain by copolymerization or graft polymerization.
- the polymer for imparting impact resistance can be added in an amount of 0 to 20 parts by mass with respect to 100 parts by mass of the crystalline polyamide resin (A).
- olefin polymer examples include homopolymers such as polyethylene, polypropylene, polybutene-1, polypentene-1, and polymethylpentene, ethylene, propylene, butene-1, pentene-1, and 4-methylpentene-1.
- ⁇ -olefins such as hexene-1, octene-1, isobutylene, 1,4-hexadiene dicyclopentadiene, 2,5-norbornadiene, 5-ethylidene norbornene, 5-ethyl-2,5-norbornadiene, 5- (1 Mention may be made of polyolefins obtained by radical polymerization of at least one kind of non-conjugated dienes such as' -probenyl) -2-norbornene using a normal metal catalyst or a metallocene-based high-performance catalyst.
- the diene elastomer is an AB type or ABA ′ type block copolymer elastic body composed of a vinyl aromatic hydrocarbon and a conjugated diene, and the end blocks A and A ′ are the same or different.
- thermoplastic homopolymers or copolymers derived from vinyl aromatic hydrocarbons, where the aromatic moiety may be monocyclic or polycyclic examples of such vinyl aromatic hydrocarbons include Styrene, ⁇ -methylstyrene, vinyl toluene, vinyl xylene, ethyl vinyl xylene, vinyl naphthalene and mixtures thereof.
- the intermediate polymer block B is composed of a conjugated diene hydrocarbon, and examples thereof include polymers derived from 1,3-butadiene, 2,3-dimethylbutadiene, isoprene, 1,3-pentadiene, and mixtures thereof. In the present invention, those obtained by subjecting the intermediate polymer block B of the block copolymer to a hydrogenation treatment are also included.
- polystyrene copolymer examples include ethylene / propylene copolymer, ethylene / butene-1 copolymer, ethylene / hexene-1 copolymer, ethylene / propylene / dicyclopentadiene copolymer, ethylene / propylene / 5-ethylidene-2-norbornene copolymer, unhydrogenated or hydrogenated polybutadiene, unhydrogenated or hydrogenated styrene / isoprene / styrene triblock copolymer, unhydrogenated or hydrogenated styrene / butadiene / styrene triblock copolymer A polymer etc. are mentioned.
- the method for introducing a carboxylic acid group or / and a carboxylic acid anhydride group is not particularly limited, and a method such as copolymerization or graft introduction to a non-modified polyolefin using a radical initiator can be used.
- these functional group-containing components are introduced in an amount of 0.1 to 20 mol%, preferably 0.5 to 12 mol%, based on the total olefin monomer in the modified polyolefin.
- the content is suitably in the range of 0.1 to 10% by weight, preferably 0.5 to 6% by weight, based on the weight of the modified polyolefin.
- the introduction amount of the functional group-containing component is below the above range, the reaction may be insufficient and impact resistance may not be sufficiently imparted, and when it exceeds the above range, the stability of the melt viscosity may be impaired. There is.
- modified polyolefin examples include maleic anhydride-modified polyethylene, maleic anhydride-modified polypropylene, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, and a part of carboxylic acid moiety in these copolymers or All salted with sodium, lithium, potassium, zinc, calcium, ethylene / methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, ethylene / methyl methacrylate copolymer, ethylene / ethyl methacrylate Copolymer, ethylene / ethyl acrylate-g-maleic anhydride copolymer (“g” represents graft, the same shall apply hereinafter), ethylene / methyl methacrylate-g-maleic anhydride copolymer, ethylene / propylene -G-maleic anhydride copolymer, ethylene / butene-1-g- Water maleic acid
- additives for polyamide can be used in the polyamide resin composition of the present invention.
- Additives are different from stabilizers, impact modifiers, flame retardants, mold release agents, slidability improvers, colorants, plasticizers, crystal nucleating agents, and crystalline polyamide resins (A) used in the present invention.
- examples thereof include polyamide and thermoplastic resins other than polyamide.
- the preferred addition amount of each additive is as described below, but the polyamide resin composition of the present invention is composed of the crystalline polyamide resin (A), special carbon black (B), and inorganic reinforcing material (essential components).
- the total of C) preferably occupies 80% by mass or more, more preferably 90% by mass or more, and even more preferably 95% by mass or more.
- Stabilizers include organic antioxidants such as hindered phenol antioxidants, sulfur antioxidants, phosphorus antioxidants, heat stabilizers, light stabilizers such as hindered amines, benzophenones, and imidazoles. Examples include ultraviolet absorbers, metal deactivators, and copper compounds. Copper compounds include cuprous chloride, cuprous bromide, cuprous iodide, cupric chloride, cupric bromide, cupric iodide, cupric phosphate, cupric pyrophosphate, Copper salts of organic carboxylic acids such as copper sulfide, copper nitrate, and copper acetate can be used. Further, as a component other than the copper compound, an alkali metal halide compound is preferably contained.
- organic antioxidants such as hindered phenol antioxidants, sulfur antioxidants, phosphorus antioxidants, heat stabilizers, light stabilizers such as hindered amines, benzophenones, and imidazoles. Examples include ultraviolet absorbers, metal deactivators, and
- alkali metal halide compound examples include lithium chloride, lithium bromide, lithium iodide, sodium fluoride, sodium chloride, bromide.
- alkali metal halide compound examples include lithium chloride, lithium bromide, lithium iodide, sodium fluoride, sodium chloride, bromide.
- examples thereof include sodium, sodium iodide, potassium fluoride, potassium chloride, potassium bromide, potassium iodide and the like.
- These additives may be used alone or in combination of several kinds.
- An optimum amount of the stabilizer may be selected, but 0 to 5 parts by mass can be added to 100 parts by mass of the crystalline polyamide resin (A).
- thermoplastic resin other than polyamide may be added as long as the effects of the present invention are not impaired.
- Polymers other than polyamide include polyphenylene sulfide (PPS), liquid crystal polymer (LCP), aramid resin, polyetheretherketone (PEEK), polyetherketone (PEK), polyetherimide (PEI), thermoplastic polyimide, polyamideimide (PAI), polyether ketone ketone (PEKK), polyphenylene ether (PPE), polyether sulfone (PES), polysulfone (PSU), polyarylate (PAR), polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene Phthalate, polycarbonate (PC), polyoxymethylene (POM), polypropylene (PP), polyethylene (PE), polymethylpentene (TPX), polystyrene ( S), polymethyl methacrylate, acrylonitrile-styrene cop
- thermoplastic resins can be blended in a molten state by melt kneading.
- the thermoplastic resin may be made into a fiber or particle and dispersed in the polyamide resin (A) used in the present invention.
- the optimum amount of the thermoplastic resin may be selected, but 0 to 50 parts by mass can be added to 100 parts by mass of the crystalline polyamide resin (A).
- the polyamide resin composition of the present invention is flame retardant within a range not impairing the effects of the present invention
- a combination of a halogen flame retardant and antimony is good
- the halogen flame retardant brominated polystyrene, Brominated polyphenylene ether, brominated bisphenol type epoxy polymer, brominated styrene maleic anhydride polymer, brominated epoxy resin, brominated phenoxy resin, decabromodiphenyl ether, decabromobiphenyl, brominated polycarbonate, perchlorocyclopentadecane and Brominated crosslinked aromatic polymers are preferred, and antimony compounds such as antimony trioxide, antimony pentoxide, and sodium antimonate are preferred.
- Non-halogen flame retardants include melamine cyanurate, red phosphorus, phosphinic acid metal salts, and nitrogen-containing phosphoric acid compounds.
- a combination of a phosphinic acid metal salt and a nitrogen-containing phosphoric acid compound is preferable, and examples of the nitrogen-containing phosphoric acid compound include melamine or a melamine condensate such as melam and melon and polyphosphoric acid reactive organisms or those.
- a mixture of At that time, addition of a hydrotalcite-based compound is preferable for preventing metal corrosion of a mold or the like.
- the optimum amount of the flame retardant may be selected, but 0 to 50 parts by mass can be added to 100 parts by mass of the crystalline polyamide resin (A).
- Examples of the release agent added to the present invention include long-chain fatty acids or their esters and metal salts, amide compounds, polyethylene wax, silicon, and polyethylene oxide.
- the long chain fatty acid preferably has 12 or more carbon atoms, and examples thereof include stearic acid, 12-hydroxystearic acid, behenic acid, and montanic acid. Partial or total carboxylic acid is esterified with monoglycol or polyglycol. Or a metal salt may be formed.
- Examples of the amide compound include ethylene bisterephthalamide and methylene bisstearyl amide. These release agents may be used alone or as a mixture. An optimum amount of the release material may be selected, but 0 to 5 parts by mass can be added to 100 parts by mass of the crystalline polyamide resin (A).
- high-molecular-weight polyethylene, acid-modified high-molecular-weight polyethylene, fluororesin powder, molybdenum disulfide, silicon resin, silicon oil, zinc, graphite, mineral oil, etc. are used as a sliding property improving material.
- the resin slidability improving material can be added in a range not impairing the characteristics of the present invention, for example, in a range of 0.05 to 3 parts by mass with respect to 100 parts by mass of the crystalline polyamide resin (A).
- the polyamide resin composition used in the present invention it is useful to add a heat-resistant agent for the heat-resistant stability of the polyamide resin composition when it is retained for a long time in a high-temperature molten state during foam molding.
- a heat-resistant agent for the heat-resistant stability of the polyamide resin composition when it is retained for a long time in a high-temperature molten state during foam molding.
- copper compounds such as copper halides such as copper acetate, copper iodide, copper chloride and copper bromide can be used as a long-term heat aging inhibitor effective in a high temperature environment of 120 ° C. or higher.
- copper compounds such as copper halides such as copper acetate, copper iodide, copper chloride and copper bromide can be used.
- the amount of the copper compound added is preferably 0.005 to 0.5 parts by mass, more preferably 0.01 to 0.5 parts by mass with respect to 100 parts by mass of the crystalline polyamide resin (A).
- the copper compound is also effective in combination with an alkali halide such as potassium iodide, potassium chloride or sodium iodide.
- an alkali halide such as potassium iodide, potassium chloride or sodium iodide.
- phosphoric antioxidants, hindered phenolic compounds, phosphite compounds, thioether compounds, and the like can be used within a known range as antioxidants and antioxidants.
- the polyamide resin composition used in the present invention is melt-kneaded with the crystalline polyamide resin (A) and the inorganic reinforcing material (C), the polyamide resin composition is colored by using special carbon black (B) for black coloring.
- the Tc2 of the resin composition can be suppressed to a range of 185 to 189 ° C. under a temperature drop condition of 10 ° C./min by DSC measurement.
- Tc2 The temperature can be adjusted in the range of 182 to 186 ° C.
- the polyamide resin composition thus adjusted can maintain an appropriate molten state until the foaming process is completed in the process of solidifying from the molten state in the mold, and only the internal pressure by the foaming agent contributes. Therefore, a good black appearance can be obtained even with a low mold transfer pressure, so that a good black appearance and a uniform foam layer can be obtained in cavity expansion foam molding.
- the foamed molded article of the present invention has a non-foamed skin layer of 100 to 800 ⁇ m on the surface layer and a foamed layer made of foamed cells having an average cell diameter of 10 to 300 ⁇ m independent of the resin continuous phase on the inner layer.
- a foamed molded product having a specific gravity of 0.2 to 1.0 and having a sandwich structure of foamed layers sandwiched between them is preferred.
- the surface layer has a non-foamed skin layer of 150 to 600 ⁇ m
- the inner layer has a foamed layer made of foamed cells having an average cell diameter of 30 to 250 ⁇ m independent of the resin continuous phase, and is sandwiched between the non-foamed skin layers
- This is a foamed molded article having a sandwich structure of foamed layers and a specific gravity of 0.25 to 0.9.
- the surface non-foamed skin layer is less than 100 ⁇ m, a good appearance cannot be obtained.
- the skin layer has a skin layer exceeding 800 ⁇ m, the specific gravity of the foamed layer is too low, so that the specific gravity is 0.2 to 1.0 in total.
- the foam structure cannot be adjusted in a uniform cell state.
- the chemical foaming agent and / or the inert gas in the supercritical state filled in the mold together with the molten resin is the resin melted in the resin melting zone of the molding machine.
- Gas components that become foaming nuclei, or added as a generation source thereof for example, inorganic compounds such as ammonium carbonate and sodium bicarbonate, and organic compounds such as azo compounds and sulfohydrazide compounds. Etc. can be used.
- the azo compound include diazocarbonamide (ADCA), 2,2-azoactivity nitronitrile, azohexahydrobenzonitrile, diazoaminobenzene, etc.
- ADCA is preferred and used.
- the sulfohydrazide compound include benzenesulfohydrazide, benzene 1,3-disulfohydrazide, diphenylsulfone-3,3-disulfonehydrazide and diphenyloxide-4,4-disulfonehydrazide.
- the nitroso compound includes Examples include N, N-dinitrosopentaethylenetetramine (DNPT) and N, N-dimethyl terephthalate.
- the azide compound include terephthal azide and P-tert-butylbenzazide.
- the chemical foaming agent used is a polyamide resin (as a foaming agent masterbatch based on a thermoplastic resin having a melting point lower than the decomposition temperature of the foaming agent in order to uniformly disperse it in the crystalline polyamide resin (A). It can be used as a mixture with A) and / or (B).
- the thermoplastic resin used as the base material can be used without particular limitation as long as it has a melting point lower than the decomposition temperature of the foaming agent, and examples thereof include polystyrene (PS), polyethylene (PE), and polypropylene (PP).
- PS polystyrene
- PE polyethylene
- PP polypropylene
- the blending ratio of the foaming agent and the thermoplastic resin is preferably 10 to 100 parts by mass of the foaming agent with respect to 100 parts by mass of the thermoplastic resin.
- the amount of the master batch mixed with the polyamide resin (A) is excessively increased, resulting in deterioration of physical properties. If it exceeds 100 parts by mass, it is difficult to make a masterbatch due to the problem of dispersibility of the foaming agent.
- the amount of carbon dioxide and / or nitrogen in a supercritical state as a foaming agent is preferably 0.05 to 30 parts by mass, more preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the polyamide resin composition. . If the foaming agent is less than 0.05 parts by mass, uniform and fine foam cells cannot be obtained, and if it exceeds 30 parts by mass, the appearance of the surface of the molded product becomes poor, so that a molded product with a good appearance cannot be obtained.
- the supercritical carbon dioxide or nitrogen used as the blowing agent can be used alone, but carbon dioxide and nitrogen may be mixed and used. Nitrogen tends to be more suitable for forming finer cells than polyamide, and carbon dioxide is more suitable for obtaining higher foaming ratios because it allows a relatively large amount of gas injection.
- the foamed structure may be mixed arbitrarily, and the mixing ratio is preferably in the range of 1: 9 to 9: 1 in terms of molar ratio.
- Examples of a method of mixing carbon dioxide and nitrogen into a molten polyamide resin composition in an injection molding machine include, for example, a method of injecting carbon dioxide and / or nitrogen in a gaseous state directly or in a pressurized state, carbon dioxide in a liquid state, and And / or a method of injecting nitrogen with a plunger pump.
- These carbon dioxide and / or nitrogen need to be in a supercritical state inside the molding machine from the viewpoints of solubility, permeability and diffusibility in the polyamide resin composition in the molten state.
- the critical state is a state in which it is possible to eliminate the distinction between the gas phase and the liquid phase in a certain temperature range and pressure range when increasing the temperature and pressure of the substance generating the gas phase and the liquid phase.
- the temperature and pressure at this time are called critical temperature and critical pressure.
- a critical fluid since a substance has both gas and liquid characteristics in a critical state, a fluid generated in this state is called a critical fluid. Since such a critical fluid has a density higher than that of a gas and a viscosity lower than that of a liquid, it has a characteristic that it can easily diffuse in a substance.
- Carbon dioxide has a critical temperature of 31.2 ° C. and a critical pressure of 7.38 MPa, and in the case of nitrogen, the critical temperature is 52.2 ° C. and the critical pressure is 3.4 MPa. It becomes an abnormal and critical state and takes a behavior as a critical fluid.
- the polyamide resin foam molded article obtained by the present invention can be used for automobile-related parts due to its excellent characteristics.
- automobile-related parts include interior parts, exterior parts, covers, housings, and load support system parts.
- heat-resistant covers such as engine covers, cylinder head covers, and mission covers.
- the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
- the measured value described in the Example is measured by the following method.
- Tm melting point
- Tc2 when cooled at 20 ° C / min was Tc2 (20 ° C / min)
- Tc2 when cooled at 10 ° C / min was Tc2 (10 ° C / min).
- the maximum load of the non-foamed molded product when the three-point bending test was performed on this cut-out test piece at a span length of 50 mm and a load speed of 2 mm / min is X (N), and the maximum load of the foamed molded product is Y (N). did.
- Y (N) / X (N) is 1.5 or more
- the load resistance improvement rate is “ ⁇ ”, and when it is 1 or more and less than 1.5, “ ⁇ ”, less than 1, or the upper foam layer is hollowed out. Therefore, the lower skin layer and the foamed layer were not destroyed at the same time, and only the upper skin layer was destroyed as “x”.
- Cell uniformity, cell diameter In a photograph taken with a scanning electron microscope, there is no cavity having an average cell diameter of 300 ⁇ m or less at any three points in a 500 ⁇ m to 2000 ⁇ m square including at least 20 adjacent cells and having a length continuity of 800 ⁇ m or more. The case was “ ⁇ ” and the others were “X”.
- the average cell diameter is a sample for cross-sectional observation that has been embedded in a visible light curable resin and then polished, or a molded product that has been adjusted so that the foamed cross-section is exposed by breakage in advance and is immersed in liquid nitrogen for 10 minutes after impact destruction Then, with respect to the sample for cross-sectional observation in which the foamed cross section was exposed, the photograph of the cross section of the foam molded body taken with a scanning electron microscope was image-processed, and the equivalent circle diameter of the cell obtained from at least 100 adjacent cells was determined as the cell diameter. The average value when three points were measured was defined as the average cell diameter. When the cell uniformity was “x” and there was a cavity having a length continuity of 800 ⁇ m or more, the average cell diameter was not measurable.
- the strand discharged from the extruder was cooled in a water bath, pelletized with a strand cutter, and dried at 125 ° C. for 5 hours to obtain a polyamide resin composition pellet.
- the master batch was used for carbon black, but the blending amount in Table 1 is the amount as carbon black.
- the mold used was a flat plate mold that can expand the cavity volume by moving the core side mold in the mold opening direction of width 100 mm, length 250 mm, thickness 2 mmt + core back amount (mmt).
- Table 1 shows the evaluation results of the polyamide foam molded articles obtained in Examples 1 to 6 and Comparative Examples 1 to 5.
- 1 is a cross-sectional photograph of a polyamide resin foam molded article of Example 1.
- the polyamide foam molded articles of Examples 1 to 6 can obtain a good black surface appearance and a uniform and fine foam cell structure, and have a lower specific gravity than that of a non-foam molded article. A great improvement in load bearing capacity can be achieved.
- Comparative Examples 1 to 5 when special carbon black is not used, a uniform foam layer cannot be obtained, and the appearance of the molded product cannot be adjusted, and non-uniform voids in the foam layer are not obtained. In some cases, the vibration resistance may not be improved, and any of the evaluation items is inferior to those of Examples 1 to 6.
- the polyamide foam molded article of the present invention gives a foam molded article having heat resistance, light weight and high load resistance without impairing the excellent physical properties and characteristics of the polyamide resin, and excellent in the appearance of black appearance. Is the body.
- the foam molded body preparation method disclosed in the past can be manufactured at low cost in terms of composition and does not use amorphous polyamide or a viscosity modifier, so that it is possible to achieve further weight reduction for automobile parts and home appliance parts. Alternatively, it is useful because it is possible to obtain a molded product excellent in vibration characteristics and heat insulation characteristic of the foamed molded product.
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Abstract
Description
ポリアミドは耐熱性と機械特性に優れた樹脂であり、高い発泡倍率でかつ均一な発泡層をもつ発泡成形体を調整できれば課題を達成することができる。しかしポリアミドの固化速度は比較的速く、発泡成形に向いていないため課題を達成するレベルの発泡成形品は非結晶ポリアミドなどを用いて結晶化温度を下げたものでしか調整できていない。また結晶化を低下させずに外観良好な成形品を調整することが困難であった。
(1)結晶性ポリアミド樹脂(A)、該結晶性ポリアミド樹脂に対して結晶化促進作用を示さないカーボンブラック(B)及び無機強化材(C)を、(A)、(B)及び(C)の合計が100質量%とした時、(A)及び(B)の合計が60~90質量%、(C)が10~40質量%となる割合で含有するポリアミド樹脂組成物であり、かつ該ポリアミド樹脂組成物が下記の特性(イ)を満足することを特徴とする発泡成形体用ポリアミド樹脂組成物。
特性(イ):X-Y≧37℃
(X:ポリアミド樹脂組成物のDSC測定(昇温速度20℃/分)における融点(℃)
Y:ポリアミド樹脂組成物のDSC測定(降温速度20℃/分)における結晶化温度(Tc2)(℃))
(2)結晶性ポリアミド樹脂(A)が脂肪族ポリアミド樹脂である前述(1)記載の発泡成形体用ポリアミド樹脂組成物。
(3)前記特性(イ)におけるY(Tc2)が、182~186℃である前述(1)又は(2)記載の発泡成形体用ポリアミド樹脂組成物。
(4)前記カーボンブラック(B)が、0.1質量%以上添加した場合でもポリアミドの結晶化を促進しない黒顔料である前述(1)~(3)のいずれかに記載の発泡成形体用ポリアミド樹脂組成物。
(5)前述(1)~(4)のいずれかに記載の発泡成形体用ポリアミド樹脂組成物を用いて得られたポリアミド樹脂発泡成形体。
(6)前述(1)~(4)のいずれかに記載の発泡成形体用ポリアミド樹脂組成物を溶融し、型締めされた複数の金型で形成されるキャビティ内に化学発泡剤および/または超臨界状態の不活性ガスとともに溶融状態の前記ポリアミド樹脂組成物を射出、充填し、射出外圧と内部からの発泡圧力によって非発泡スキン層が形成された段階で少なくとも一つのコア側金型を型開き方向へ移動させキャビティの容積を発泡成形体の容積に拡大させることにより得られるポリアミド樹脂発泡成形体。
(7)ポリアミド樹脂発泡成形体が自動車関連部品である前述(5)または(6)に記載のポリアミド樹脂発泡成形体。
(8)前記自動車関連部品が、内装品、外装品、カバー類、筐体および荷重支持系部品から選ばれる1種である前述(7)記載のポリアミド樹脂発泡成形体。
(9)前記自動車関連部品が、エンジンカバー、シリンダーヘッドカバー、及びミッションカバーのいずれかの耐熱カバーである前述(7)記載のポリアミド樹脂発泡成形体。
本発明で用いられる結晶性ポリアミド樹脂(A)は、ラクタムやω-アミノカルボン酸、ジカルボン酸及びジアミンなどを原料とし、これらの重縮合によって得られるポリアミド樹脂、又はこれらの共重合体やブレンド物である。具体的にはアミン成分としては、1,2-エチレンジアミン、1,3-トリメチレンジアミン、1,4-テトラメチレンジアミン、1,5-ベンタメチレンジアミン、2-メチル-1,5-ペンタメチレンジアミン、1,6-ヘキサメチレンジアミン、1,7-ヘプタメチレンジアミン、1,8-オクタメチレンジアミン、1,9-ノナメチレンジアミン、2-メチル-1,8-オクタメチレンジアミン、1,10-デカメチレンジアミン、1,11-ウンデカメチレンジアミン、1,12-ドデカメチレンジアミン、1,13-トリデカメチレンジアミン、1,16-ヘキサデカメチレンジアミン、1,18-オクタデカメチレンジアミン、2,2,4(または2,4,4)-トリメチルヘキサメチレンジアミンのような脂肪族ジアミン、ピペラジン、シクロヘキサンジアミン、ビス(3-メチル-4-アミノヘキシル)メタン、ビス-(4,4’-アミノシクロヘキシル)メタン、イソホロンジアミンのような脂環式ジアミン、メタキシリレンジアミン、パラキシリレンジアミン、パラフェニレンジアミン、メタフェニレンジアミンなどの芳香族ジアミンおよびこれらの水添物等があげられる。ポリアミドの酸成分としては、以下に示す多価カルボン酸、もしくは酸無水物を使用できる。多価カルボン酸としては、例えば、テレフタル酸、イソフタル酸、オルソフタル酸、1,5-ナフタレンジカルボン酸、2,6-ナフタレンジカルボンル酸、4,4’-ジフェニルジカルボン酸、2,2’-ジフェニルジカルボン酸、4,4’-ジフェニルエーテルジカルボン酸、5-スルホン酸ナトリウムイソフタル酸、5-ヒドロキシイソフタル酸等の芳香族ジカルボン酸、フマル酸、マレイン酸、コハク酸、イタコン酸、アジピン酸、アゼライン酸、セバシン酸、1,11-ウンデカン二酸、1,12-ドデカン二酸、1,14-テトラデカン二酸、1,18-オクタデカン二酸、1,4-シクロヘキサンジカルボン酸、1,3-シクロヘキサンジカルボン酸、1,2-シクロヘキサンジカルボン酸、4-メチル-1,2-シクロヘキサンジカルボン酸、ダイマー酸等の脂肪族や脂環族ジカルボン酸等があげられる。また、ε-カプロラクタムなどのラクタムおよびこれらが開環した構造であるアミノカルボン酸、ウンデカンラクタム、ラウリルラクタムおよびこれらが開環した構造である11-アミノウンデカン酸、12-アミノドデカン酸等があげられ、これらの成分より重合されるポリアミドとしては、ポリカプロアミド(ポリアミド6)、ポリウンデカミド(ポリアミド11)、ポリラウラミド(ポリアミド12)、ポリテトラメチレンアジパミド(ポリアミド46)、ポリヘキサメチレンアジパミド(ポリアミド66)、ポリウンデカメチレンアジパミド(ポリアミド116)、ポリメタキシリレンアジパミド(ポリアミドMXD6)、ポリパラキシリレンアジパミド(ポリアミドPXD6)、ポリテトラメチレンセバカミド(ポリアミド410)、ポリヘキサメチレンセバカミド(ポリアミド610)、ポリデカメチレンアジパミド(ポリアミド106)、ポリデカメチレンセバカミド(ポリアミド1010)、ポリヘキサメチレンドデカミド(ポリアミド612)、ポリデカメチレンドデカミド(ポリアミド1012)、ポリヘキサメチレンイソフタルアミド(ポリアミド6I)、ポリテトラメチレンテレフタルアミド(ポリアミド4T)、ポリペンタメチレンテレフタルアミド(ポリアミド5T)、ポリ-2-メチルペンタメチレンテレフタルアミド(ポリアミドM-5T)、ポリヘキサメチレンテレフタルアミド(ポリアミド6T)、ポリヘキサメチレンヘキサヒドロテレフタルアミド(ポリアミド6T(H))、ポリノナメチレンテレフタルアミド(ポリアミド9T)、ポリウンデカメチレンテレフタルアミド(ポリアミド11T)、ポリドデカメチレンテレフタルアミド(ポリアミド12T)、ポリビス(3-メチル-4-アミノヘキシル)メタンテレフタルアミド(ポリアミドPACMT)、ポリビス(3-メチル-4-アミノヘキシル)メタンイソフタルアミド(ポリアミドPACMI)、ポリビス(3-メチル-4-アミノヘキシル)メタンドデカミド(ポリアミドPACM12)、ポリビス(3-メチル-4-アミノヘキシル)メタンテトラデカミド(ポリアミドPACM14)が挙げられ、結晶性ポリアミド樹脂(A)としては前述のポリアミド群および/もしくはその共重合体および/もしくはこれらのブレンド組成物があげられる。
ポリアミド6の結晶化速度は、DSC降温時結晶化温度(Tc2)を指標として評価することができ、重合直後のポリアミド6の10℃/分におけるTc2は、179~175℃である。これを例えば、ガラス繊維(GF)を添加して二軸押出機で混練りした場合、混練り後のペレット(ポリアミド樹脂組成物)のTc2は、188~190℃前後まで上昇する。さらに、一般的に汎用カーボンブラックとして用いられるファーネスタイプのカーボンブラックを添加した場合のTc2は、191~194℃以上となり、190℃以下に調整することができない。
特性(イ):X-Y≧37℃
(X:ポリアミド樹脂組成物のDSC測定(昇温速度20℃/分)における融点(℃)
Y:ポリアミド樹脂組成物のDSC測定(降温速度20℃/分)における結晶化温度(Tc2)(℃))
本発明で用いられるポリアミド樹脂に対して結晶化促進作用を示さないカーボンブラック(B)は、カーボンブラック(B)が、0.1質量%以上添加した場合でもポリアミドの結晶化を促進しない黒顔料であることが好ましい。例えば、ポリアミド6(A)69質量部、該カーボンブラック(B)1質量部及び無機強化材(C)30質量部となる割合で含有するポリアミド樹脂組成物のDSC評価における20℃/分の降温条件で測定されるTc2が、182~186℃になるカーボンブラックであることが好ましい。
本発明で用いられる結晶性ポリアミド樹脂に対して結晶化促進作用を示さないカーボンブラック(B)としては、「住化カラー社製 EPC840」(マスターベース:LDPE樹脂)、「レジノカラー社製 PEC-TT1617」(マスターベース:LDPE樹脂)が、カーボンブラックマスターバッチとして市販されており、使用可能である。
これらの繊維状強化材の中で、特にガラス繊維、炭素繊維などが好ましく用いられる。これらの繊維状強化材は、有機シラン系化合物、有機チタン系化合物、有機ボラン系化合物およびエポキシ系化合物等のカップリング剤で予め処理をしてあるものが好ましく、カルボン酸基又は/及びカルボン酸無水物基と反応しやすいものが特に好ましい。カップリング剤で処理してあるガラス繊維を配合したポリアミド系樹脂組成物では優れた機械的特性や外観特性の優れた成形品が得られるので好ましい。また 他の繊維状強化材においても、カップリング剤が未処理の場合は後添加して使用することが出来る。
ガラス繊維としては、繊維長1~20mm程度に切断されたチョップドストランド状のものが好ましく使用できる。ガラス繊維の断面形状としては、円形断面及び非円形断面のガラス繊維を用いることができる。非円形断面のガラス繊維としては、繊維長の長さ方向に対して垂直な断面において略楕円系、略長円系、略繭形系であるものをも含み、偏平度が1.5~8であることが好ましい。ここで偏平度とは、ガラス繊維の長手方向に対して垂直な断面に外接する最小面積の長方形を想定し、この長方形の長辺の長さを長径とし、短辺の長さを短径としたときの、長径/短径の比である。ガラス繊維の太さは特に限定されるものではないが、短径が1~20μm、長径2~100μm程度である。強化材の添加量は最適な量を選択すれば良いが、結晶性ポリアミド樹脂(A)、カーボンブラック(B)及び無機強化材(C)の合計が100質量%とした時、(A)及び(B)の合計が60~90質量%、(C)が10~40質量%となる配合量で添加することが可能である。(C)の配合量が40質量%を超えるとマトリクス樹脂が少ないため、結晶性ポリアミドと特殊カーボンブラックによる結晶化および、粘度調整だけでは発泡時の溶融樹脂の伸びが無くなり均一な発泡状態と成形品外観を得ることができない。(C)の配合量は、12~38質量%であることが好ましく、15~35質量%であることがより好ましい。
オレフィン系重合体の具体的な例としては、ポリエチレン、ポリプロピレン、ポリブテン-1、ポリペンテン-1、ポリメチルペンテンなどのホモポリマー、エチレン、プロピレン、ブテン-1、ペンテン-1、4-メチルペンテン-1、ヘキセン-1、オクテン-1、イソブチレンなどのα-オレフィン、1,4-ヘキサジエンジシクロペンタジエン、2,5-ノルボルナジエン、5-エチリデンノルボルネン、5-エチル-2,5-ノルボルナジエン、5-(1’-プロベニル)-2-ノルボルネンなどの非共役ジエンの少なくとも1種を通常の金属触媒、あるいはメタロセン系高性能触媒を用いてラジカル重合して得られるポリオレフィンを挙げることができる。
これらの中で、ポリアミド中のアミンとの反応性が高いカルボン酸無水物基を有する重合体、共重合体が好ましい。
各添加剤の好ましい添加量は、下記に説明するとおりであるが、本発明のポリアミド樹脂組成物は、必須成分である結晶性ポリアミド樹脂(A)、特殊カーボンブラック(B)及び無機強化材(C)の合計で80質量%以上を占めることが好ましく、90質量%以上を占めることがより好ましく、95質量%以上を占めることがさらに好ましい。
銅化合物は、またヨウ化カリウム、塩化カリウム、ヨウ化ナトリウムのようなハロゲン化アルカリとの併用も効果的である。またその他の耐熱剤としては、抗酸化剤や酸化防止剤としてリン系酸化防止剤やヒンダードフェノール系化合物、ホスファイト化合物、チオエーテル系化合物等も公知の範囲で使用することが出来る。
[数平均分子量]
各試料を2mg秤量し、4mlのHFIP/トリフルオロ酢酸ナトリウム10mMに溶解させた。0.2μmのメンブレンフィルターでろ過し、得られた試料溶液のゲルパーミエーションクロマトグラフィー(GPC)分析を次の条件で行った。
・装置:TOSOH HLC-8220GPC
・カラム:TSKgel SuperHM-H×2、TSKgel SuperH2000
・流速:0.25ml/分、濃度:0.05質量%、温度:40℃、検出器:RI
・分子量換算は標準ポリメチルメタクリレート換算で計算した。
・分子量は、1000以下のものは、オリゴマーとして除いて計算した。
105℃で15時間減圧乾燥したポリアミド成形体試料をアルミニウム製パン(TA Instruments社製、品番900793.901)に10mg計量し、アルミニウム製蓋(TA Instruments社製、品番900794.901)で密封状態にして、測定試料を調製した後、示差走査熱量計DSCQ100(TA INSTRUMENTS製)を用いて室温から20℃/分で昇温して、350℃で3分間保持した後に測定試料パンを取出し、液体窒素に漬け込み、急冷させた。その後、液体窒素からサンプルを取出し、室温で30分間放置した後、再び、示差走査熱量計DSCQ100(TA INSTRUMENTS製)を用いて室温から20℃/分で350℃まで昇温して、その際の融解による吸熱のピーク温度を融点:Tm(20℃/分)とした。その後300℃まで80℃/分で冷却し5分ホールドしたあと、20℃/分もしくは10℃/分で23℃まで冷却した。20℃/分で冷却した際のTc2をTc2(20℃/分)、10℃/分で冷却した際のTc2をTc2(10℃/分)とした。
(A)結晶性ポリアミド樹脂
(a1)相対粘度RV=2.4のポリアミド6、「東洋紡ナイロンT-840」数平均分子量17700
(a2)相対粘度RV=1.9のポリアミド6、「東洋紡ナイロンT-860」数平均分子量14400
(a3)相対粘度RV=3.1のポリアミド6、「東洋紡ナイロンT-820」数平均分子量25400
(B)カーボンブラックマスターバッチ
(b1)汎用カーボンブラックマスターバッチ、「住化カラー社製 EPC8E313」マスターベース=LDPE樹脂
(b2)汎用カーボンブラックマスターバッチ、「住化カラー社製 PAB8K500」マスターベース=AS樹脂
(b3)特殊カーボンブラックマスターバッチ、「住化カラー社製 EPC840」マスターベース=LDPE樹脂
(b4)特殊カーボンブラックマスターバッチ、「レジノカラー社製 PEC-TT1617」マスターベース=LDPE樹脂
(c1)ガラス繊維-1:CS3PE453(日東紡績株式会社)
(c2)ガラス繊維-2:CSG3PA810S(日東紡績株式会社)
(c3)ガラスビーズ:GB731A-PN(ポッターズバロティーニ社)
[その他 添加剤]
安定剤:イルガノックスB1171(BASF社)
離型剤:モンタン酸エステルワックス WE40(クラリアントジャパン社)
日本製鋼所製の電動射出成形機を用いて、以下の条件で成形した。
最大型締め力1800kN
スクリュー径42mm(L/D=30)
金型寸法:幅100mm×長さ250mm×厚み2mmt平板
(コアバックによる金型容積拡張で同幅、同長さで2mm+コアバック量(mm)の厚み調整可能)
幅100mm×長さ250mm×厚み2mmtの平板金型で成形されたポリアミド非発泡成形品と、各実施例・比較例の発泡条件でキャビティをコアバック拡張して得られたポリアミド発泡成形品を温度80℃、湿度95%環境下に24hr放置後、幅10mm×長さ100mmの試験片を切り出した。この切り出し試験片をスパン長50mm、荷重速度2mm/minで三点曲げ試験を実施した時の非発泡成形品の最大荷重をX(N)とし、発泡成形品の最大荷重をY(N)とした。Y(N)/X(N)が1.5以上のものを耐荷重向上率「○」とし、1以上1.5未満のものを「△」、1未満または上部の発泡層が空洞化しているため下部スキン層、発泡層が同時に破壊せず上部スキン層のみが破壊したものを「×」とした。
走査性電子顕微鏡により撮影した写真において、少なくとも20個の隣接するセルを含む500μm~2000μm四方の任意箇所三点の平均セル径が300μm以下で、かつ800μm以上の長さ連続性を持つ空洞がない場合を「○」、それ以外を「×」とした。平均セル径は、可視光硬化型樹脂に包埋後研磨した断面観察用サンプルか、予めノッチをつけて破壊によって発泡断面が露出するように調整した成形品を液体窒素に10分間浸漬後に衝撃破壊して発泡断面を露出させた断面観察用サンプルに関して、発泡成形体断面を走査性電子顕微鏡により撮影した写真を画像処理し、少なくとも100個の隣接するセルより求めたセルの円相当径をセル径とし、これを三点測定した時の平均値を平均セル径とした。セルの均一性が「×」で、かつ800μm以上の長さ連続性を持つ空洞がある場合は、平均セル径を測定不可とした。
可視光硬化型樹脂に包埋後研磨した断面観察用サンプルか、予めノッチをつけて破壊によって発泡断面が露出するように調整した成形品を液体窒素に10分間浸漬後に衝撃破壊して発泡断面を露出させた断面観察用サンプルに関して、発泡成形体断面を走査性電子顕微鏡により撮影した写真において、発泡断面の観察において表層部分に一体化した非発泡層の厚みをスキン層厚みとして測定した。
発泡成形品から四辺に切り出し面を有する25mm×25mm×厚みの試験片を切り出し、JIS Z8807固体比重測定方法に準じて比重測定を行なった。スキン層/発泡層/スキン層のサンドイッチ構造において、発泡層が充分に形成されず上下のスキン層が分離した場合は、複数に分かれた切り出し試験片で同時に比重測定をおこなった。
前述の成形品のシボ部分を目視で評価し、ガラス等充填材が表面に浮いてシボ形状と異なる表面凹凸の激しいものや、目視で確認できるヒケやシルバー、フラッシュを伴うものを「×」とした。シボの凹凸以外に充填材の表面浮き等による凹凸がなく、目視で確認できるシルバー、フラッシュ等外観不良のない表面の綺麗な状態のものを「○」とした。
上記した各原料を表1に示した配合比率(その他の添加剤は組成物((A)+(B)+(C))100質量部に対して、安定剤:0.4質量部、離型剤:0.4質量部)に従い計量して、35φ二軸押出機(東芝機械社製)でシリンダー温度は280℃に設定し、スクリュー回転数100rpmにて無機強化材(C)以外を指定量混合したものをホッパーより同時に投入して溶融混練し、無機強化材(C)をサイドフィードで投入した。押出機から吐出されたストランドは水槽で冷却してストランドカッターでペレット化し、125℃にて5時間乾燥してポリアミド樹脂組成物のペレットを得た。
カーボンブラックはマスターバッチを使用したが、表1の配合量は、カーボンブラックとしての量である。
図2に示された概略構成図様に型締め力1800kN、口径42mm、L/D=30のスクリューを持つ電動射出成形機の可塑化領域で、シリンダー温度を290~310℃設定で可塑化し、窒素を臨界状態で表1に記載の量注入し、表面温度100℃に温調された金型に射出充填後、射出外圧と内部からの発泡圧力によって100~800μmの非発泡スキン層が形成された段階でコア側金型を型開き方向へ移動させキャビティの容積を発泡成形体の容積に拡大させて発泡成形体を得た。金型は幅100mm、長さ250mm、厚み2mmt+コアバック量(mmt)の型開き方向へコア側金型を移動することでキャビティ容積を拡張できる平板作製用金型を使用した。
表1に実施例1~6、比較例1~5で得られたポリアミド発泡成形体の評価結果を示す。図1は実施例1のポリアミド樹脂発泡成形体の断面写真である。
2 ホッパー
3 ガスボンベ
4 昇圧ポンプ
5 開閉バルブ
6 金型(固定側)
7 金型(コア・稼動側)
8 キャビティ(成型品)
9 圧力制御バルブ
Claims (9)
- 結晶性ポリアミド樹脂(A)、該結晶性ポリアミド樹脂に対して結晶化促進作用を示さないカーボンブラック(B)及び無機強化材(C)を、(A)、(B)及び(C)の合計が100質量%とした時、(A)及び(B)の合計が60~90質量%、(C)が10~40質量%となる割合で含有するポリアミド樹脂組成物であり、かつ該ポリアミド樹脂組成物が下記の特性(イ)を満足することを特徴とする発泡成形体用ポリアミド樹脂組成物。
特性(イ):X-Y≧37℃
(X:ポリアミド樹脂組成物のDSC測定(昇温速度20℃/分)における融点(℃)
Y:ポリアミド樹脂組成物のDSC測定(降温速度20℃/分)における結晶化温度(Tc2)(℃)) - 結晶性ポリアミド樹脂(A)が脂肪族ポリアミド樹脂である請求項1記載の発泡成形体用ポリアミド樹脂組成物。
- 前記特性(イ)におけるY(Tc2)が、182~186℃である請求項1又は2記載の発泡成形体用ポリアミド樹脂組成物。
- 前記カーボンブラック(B)が、0.1質量%以上添加した場合でもポリアミドの結晶化を促進しない黒顔料である請求項1~3のいずれかに記載の発泡成形体用ポリアミド樹脂組成物。
- 請求項1~4のいずれかに記載の発泡成形体用ポリアミド樹脂組成物を用いて得られたポリアミド樹脂発泡成形体。
- 請求項1~4のいずれかに記載の発泡成形体用ポリアミド樹脂組成物を溶融し、型締めされた複数の金型で形成されるキャビティ内に化学発泡剤および/または超臨界状態の不活性ガスとともに溶融状態の前記ポリアミド樹脂組成物を射出、充填し、射出外圧と内部からの発泡圧力によって非発泡スキン層が形成された段階で少なくとも一つのコア側金型を型開き方向へ移動させキャビティの容積を発泡成形体の容積に拡大させることにより得られるポリアミド樹脂発泡成形体。
- ポリアミド樹脂発泡成形体が自動車関連部品である請求項5または6に記載のポリアミド樹脂発泡成形体。
- 前記自動車関連部品が、内装品、外装品、カバー類、筐体および荷重支持系部品から選ばれる1種である請求項7記載のポリアミド樹脂発泡成形体。
- 前記自動車関連部品が、エンジンカバー、シリンダーヘッドカバー、及びミッションカバーのいずれかの耐熱カバーである請求項7記載のポリアミド樹脂発泡成形体。
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Also Published As
Publication number | Publication date |
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US20160032068A1 (en) | 2016-02-04 |
JPWO2014185371A1 (ja) | 2017-02-23 |
JP6394394B2 (ja) | 2018-09-26 |
CN105283493B (zh) | 2018-07-03 |
CN105283493A (zh) | 2016-01-27 |
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