TWI530516B - A method for producing a foamed particle, a manufacturing apparatus for a foamed particle, and a foamed particle - Google Patents
A method for producing a foamed particle, a manufacturing apparatus for a foamed particle, and a foamed particle Download PDFInfo
- Publication number
- TWI530516B TWI530516B TW103111779A TW103111779A TWI530516B TW I530516 B TWI530516 B TW I530516B TW 103111779 A TW103111779 A TW 103111779A TW 103111779 A TW103111779 A TW 103111779A TW I530516 B TWI530516 B TW I530516B
- Authority
- TW
- Taiwan
- Prior art keywords
- particles
- foaming
- pressurized container
- expanded
- resin
- Prior art date
Links
- 239000002245 particle Substances 0.000 title claims description 203
- 238000004519 manufacturing process Methods 0.000 title claims description 38
- 238000005187 foaming Methods 0.000 claims description 103
- 239000011324 bead Substances 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 239000000805 composite resin Substances 0.000 claims description 20
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 20
- 239000011347 resin Substances 0.000 claims description 20
- 239000004088 foaming agent Substances 0.000 claims description 19
- 238000005470 impregnation Methods 0.000 claims description 19
- 229920005672 polyolefin resin Polymers 0.000 claims description 18
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 claims description 14
- 229920005990 polystyrene resin Polymers 0.000 claims description 13
- 239000001273 butane Substances 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000004604 Blowing Agent Substances 0.000 claims description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 53
- 238000006116 polymerization reaction Methods 0.000 description 42
- -1 polypropylene Polymers 0.000 description 20
- 239000003112 inhibitor Substances 0.000 description 16
- 239000012736 aqueous medium Substances 0.000 description 15
- 229910001873 dinitrogen Inorganic materials 0.000 description 15
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- 229920013716 polyethylene resin Polymers 0.000 description 14
- 230000000694 effects Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 239000003431 cross linking reagent Substances 0.000 description 9
- 239000006260 foam Substances 0.000 description 9
- 239000000178 monomer Substances 0.000 description 9
- 239000003505 polymerization initiator Substances 0.000 description 9
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000002270 dispersing agent Substances 0.000 description 6
- NNPPMTNAJDCUHE-UHFFFAOYSA-N isobutane Chemical compound CC(C)C NNPPMTNAJDCUHE-UHFFFAOYSA-N 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 6
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 5
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- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 4
- 239000007983 Tris buffer Substances 0.000 description 4
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- UPIWXMRIPODGLE-UHFFFAOYSA-N butyl benzenecarboperoxoate Chemical compound CCCCOOC(=O)C1=CC=CC=C1 UPIWXMRIPODGLE-UHFFFAOYSA-N 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- RVEASLJBVZGRIP-UHFFFAOYSA-K dinitrosooxybismuthanyl nitrite Chemical compound [Bi+3].[O-]N=O.[O-]N=O.[O-]N=O RVEASLJBVZGRIP-UHFFFAOYSA-K 0.000 description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
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- 239000001282 iso-butane Substances 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 230000000379 polymerizing effect Effects 0.000 description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 3
- 239000004094 surface-active agent Substances 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
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- 235000012222 talc Nutrition 0.000 description 3
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
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- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-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
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
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- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 2
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 2
- LGZXFTPALJTFHY-UHFFFAOYSA-L N1C(CC=C1)C(=O)[O-].[Mg+2].N1C(CC=C1)C(=O)[O-] Chemical compound N1C(CC=C1)C(=O)[O-].[Mg+2].N1C(CC=C1)C(=O)[O-] LGZXFTPALJTFHY-UHFFFAOYSA-L 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 2
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 125000005250 alkyl acrylate group Chemical group 0.000 description 2
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- LBAYFEDWGHXMSM-UHFFFAOYSA-N butaneperoxoic acid Chemical compound CCCC(=O)OO LBAYFEDWGHXMSM-UHFFFAOYSA-N 0.000 description 2
- DTGWMJJKPLJKQD-UHFFFAOYSA-N butyl 2,2-dimethylpropaneperoxoate Chemical compound CCCCOOC(=O)C(C)(C)C DTGWMJJKPLJKQD-UHFFFAOYSA-N 0.000 description 2
- 239000012986 chain transfer agent Substances 0.000 description 2
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- 238000005520 cutting process Methods 0.000 description 2
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- QWTDNUCVQCZILF-UHFFFAOYSA-N isopentane Chemical compound CCC(C)C QWTDNUCVQCZILF-UHFFFAOYSA-N 0.000 description 2
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- 229920000092 linear low density polyethylene Polymers 0.000 description 2
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- UAEPNZWRGJTJPN-UHFFFAOYSA-N methylcyclohexane Chemical compound CC1CCCCC1 UAEPNZWRGJTJPN-UHFFFAOYSA-N 0.000 description 2
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- CRSOQBOWXPBRES-UHFFFAOYSA-N neopentane Chemical compound CC(C)(C)C CRSOQBOWXPBRES-UHFFFAOYSA-N 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 150000001451 organic peroxides Chemical class 0.000 description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 2
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- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
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- 238000003825 pressing Methods 0.000 description 2
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- VGTPCRGMBIAPIM-UHFFFAOYSA-M sodium thiocyanate Chemical compound [Na+].[S-]C#N VGTPCRGMBIAPIM-UHFFFAOYSA-M 0.000 description 2
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- LNAZSHAWQACDHT-XIYTZBAFSA-N (2r,3r,4s,5r,6s)-4,5-dimethoxy-2-(methoxymethyl)-3-[(2s,3r,4s,5r,6r)-3,4,5-trimethoxy-6-(methoxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6r)-4,5,6-trimethoxy-2-(methoxymethyl)oxan-3-yl]oxyoxane Chemical compound CO[C@@H]1[C@@H](OC)[C@H](OC)[C@@H](COC)O[C@H]1O[C@H]1[C@H](OC)[C@@H](OC)[C@H](O[C@H]2[C@@H]([C@@H](OC)[C@H](OC)O[C@@H]2COC)OC)O[C@@H]1COC LNAZSHAWQACDHT-XIYTZBAFSA-N 0.000 description 1
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- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- ZNNZYHKDIALBAK-UHFFFAOYSA-M potassium thiocyanate Chemical compound [K+].[S-]C#N ZNNZYHKDIALBAK-UHFFFAOYSA-M 0.000 description 1
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- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 1
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- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- KKKDGYXNGYJJRX-UHFFFAOYSA-M silver nitrite Chemical compound [Ag+].[O-]N=O KKKDGYXNGYJJRX-UHFFFAOYSA-M 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 1
- 235000010378 sodium ascorbate Nutrition 0.000 description 1
- 229960005055 sodium ascorbate Drugs 0.000 description 1
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- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Substances [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 1
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- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000004250 tert-Butylhydroquinone Substances 0.000 description 1
- 235000019281 tert-butylhydroquinone Nutrition 0.000 description 1
- 229950011008 tetrachloroethylene Drugs 0.000 description 1
- KTQYWNARBMKMCX-UHFFFAOYSA-N tetraphenylene Chemical group C1=CC=C2C3=CC=CC=C3C3=CC=CC=C3C3=CC=CC=C3C2=C1 KTQYWNARBMKMCX-UHFFFAOYSA-N 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
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- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
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- 239000003021 water soluble solvent Substances 0.000 description 1
- MLVWCBYTEFCFSG-UHFFFAOYSA-L zinc;dithiocyanate Chemical compound [Zn+2].[S-]C#N.[S-]C#N MLVWCBYTEFCFSG-UHFFFAOYSA-L 0.000 description 1
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/22—After-treatment of expandable particles; Forming foamed products
- C08J9/228—Forming foamed products
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/16—Making expandable particles
- C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
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Description
本發明係有關於發泡粒子之製造方法、發泡粒子之製造裝置及發泡粒子。更詳而言之,本發明係有關於使發泡性粒子分成2次以上之批次地發泡而獲得發泡粒子時,可抑制發泡粒子之體積倍數在每一發泡批次不同之發泡粒子之製造方法及發泡粒子之製造裝置,抑制每一批次之體積倍數不均一之發泡粒子。
含有聚烯烴系樹脂及聚苯乙烯系樹脂作為基材樹脂且由已熔著之發泡粒子所構成的發泡成形體兼具聚烯烴系樹脂之優異彈性及聚苯乙烯系樹脂之優異剛性,而作為汽車及包裝用緩衝材等使用。
發泡成形體係例如藉由以下方法製造。即,使發泡劑含浸到樹脂粒子中,獲得發泡性粒子。接著,在反應容器內使發泡性粒子發泡(預備發泡)而獲得發泡粒子(預備發泡粒子)。又,藉由在模具內填充發泡粒子,且在模具內發泡,可獲得發泡成形體。如此之發泡成形體之製造方法一般稱為珠粒法,且例如,亦記載於日本專利第4072554
號公報(專利文獻1)中。
又,發泡性粒子及發泡粒子之分別製造通常藉由每匯集一定量進行之方法,即所謂批次處理進行。發泡粒子係高倍地發泡發泡粒子之粒子,因此體積比發泡性粒子大。因此,為藉由1次之發泡獲得發泡粒子時,需要很大之發泡粒子製造用之發泡容器。
但是,由製造設備費用上升之觀點來看,增大發泡粒子製造用之發泡容器不實際。此外,一次製造大量之發泡粒子時,由發泡性粒子與用以發泡之蒸氣接觸之次數產生不平衡,且發泡粒子之體積倍數產生差之觀點來看,增大發泡容器亦不實際。
因此,藉1次含浸獲得之發泡性粒子一般係藉由分成多數次(多數批次)發泡,獲得發泡粒子。
專利文獻1:日本專利第4072554號公報
發泡劑含浸後之發泡性粒子在經過一段時間後散逸。因此,製造發泡性粒子後,到製造發泡粒子為止之時間長時,以慢程序獲得之發泡粒子與以快程序獲得之發泡粒子間之體積倍數產生差。產生差時,由發泡粒子獲得之發泡成形體之物性會產生不均一的情形。在發泡性粒子
之基材樹脂係聚烯烴系樹脂及聚苯乙烯系樹脂時,由於聚烯烴系樹脂之散逸性高,故該不均一之情形更顯著地產生。
因此,希望提供發泡粒子之體積倍數不產生上述差之製造方法。
本發明之發明人等發現,藉由在發泡前在特定壓力及溫度下保持發泡性粒子後施行發泡步驟,可抑制與以慢程序發泡之發泡粒子間之體積倍數產生差。
因此依據本發明,提供一種發泡粒子之製造方法,係將含有基材樹脂及發泡劑之發泡性粒子至少分成2次以上地施行發泡步驟,該基材樹脂為聚烯烴系樹脂與聚苯乙烯系樹脂之複合樹脂,前述發泡性粒子係於保持在加壓容器內之後方施行前述發泡步驟,該加壓容器維持0.1至0.4MPa及-20至30℃。
又,依據本發明,可提供一種發泡粒子之製造裝置,該製造裝置係用於製造上述發泡粒子,具有用以保持發泡性粒子之加壓容器、使發泡性粒子發泡之發泡容器、及將發泡性粒子由前述加壓容器搬送至發泡容器之機構;前述加壓容器具有用以使內壓及內溫維持於0.1至0.4MPa及-20至30℃之機構。
又,依據本發明,可提供一種發泡粒子,其係藉由上述方法獲得之發泡粒子;且,不同發泡步驟所得發泡粒子間之體積倍數之偏差係抑制在3.0倍以內。
依據本發明,可提供一種發泡粒子之製造方法及製造裝置,其可使發泡粒子之體積倍數在每發泡批次發生不同之情況受到抑制。又,可提供一種每批次之體積倍數偏差已受抑制之發泡粒子。
又,依據本發明,可提供一種發泡粒子之製造方法,其將發泡性粒子至少分成2次以上地施行發泡步驟,並且藉由具有下述步驟中之至少一者,而可使發泡粒子之體積倍數在每發泡批次發生不同的情況受到抑制:(1)發泡性粒子保持在充滿環境氣體之加壓容器內,該環境氣體包含氮或丁烷;(2)發泡性粒子保持在加壓容器內5至720分鐘。
(A)發泡粒子之製造方法
(製造條件)
在本發明中,在將含有聚烯烴系樹脂及聚苯乙烯系樹脂之複合樹脂之基材樹脂及發泡劑之發泡性粒子至少分成2次以上地施行發泡步驟而製造發泡粒子時,在保持發泡性粒子於維持在0.1至0.4MPa及-20至30℃之加壓容器內後,立即施行前述發泡步驟。藉在如此之預定壓力及溫度下維持發泡性粒子,可抑制以快程序發泡之發泡粒子與以
慢程序發泡之發泡粒子間之體積倍數產生差。
本發明人等如下地考慮該理由。即,以慢程序施行發泡之發泡性粒子,與以快程序施行發泡之發泡性粒子比較,發泡劑量容易因散逸變少。具體而言,發泡性粒子係在施加預定內壓之容器中保持至發泡為止。由容器內取出在1次發泡所使用之發泡性粒子,但是此時容器內之壓力降低,且發泡劑由容器中之發泡性粒子散逸。因此,以慢程序施行發泡之發泡性粒子之發泡劑會大量散逸。因此,藉將發泡性粒子保持在上述條件之加壓容器內可抑制散逸之發泡劑量,或者藉於發泡性粒子內含浸加壓容器內之環境氣體,可補充散逸之發泡劑量,結果,可抑制體積倍數之不均一。
在此,環境氣體可都使用以下記載之作為發泡劑使用之氣體。特佳的是,考慮安全性時包含氮,且考慮不均一之抑制時包含丁烷。
本發明之製造方法,由進一步抑制體積倍數之不均一之觀點來看,宜在每次(每一批次)使用經過1次發泡劑之含浸步驟之發泡性粒子。發泡之次數係至少2次。該次數可依據反應容器之容量適當地設定。使經過1次發泡劑之含浸步驟之發泡性粒子發泡之較佳次數係2至200次。次數可為2次、50次、100次、150次、200次。較佳之次數係2至100次。又,每一批次之發泡性粒子之量宜為1至50kg(例如,可採用1kg、5kg、10kg、20kg、30kg、40kg、50kg),且1至30kg更佳。
加壓容器只要可施加預定壓力即可,沒有特別限制。
加壓容器內之壓力係0.1至0.4MPa。小於0.1MPa時,補充散逸之發泡劑量之效果不足,且體積倍數不均一之抑制會不足。另一方面,比0.4MPa高時,散逸之發泡劑量以上之環境氣體會含浸於發泡性粒子,不均一反而會變大。壓力可為0.1MPa、0.15MPa、0.2MPa、0.25MPa、0.3MPa、0.35MPa、0.4MPa。較佳之壓力係0.15至0.3MPa。
加壓容器內之溫度係-20至30℃,小於-20℃時,與在發泡步驟之加熱溫度差激增,且因急劇加熱發泡粒子之氣泡膜硬裂而使物性降低或外觀不良。另一方面,比30℃高時,會在壓力釋放時因急劇之氣體散逸而造成發泡不均一。溫度可為-20℃、-10℃、0℃、10℃、20℃、30℃。較佳之溫度係0至20℃。
在加壓容器內之保持時間係對應於由發泡性粒子之保持開始時間至取出發泡性粒子之全量的時間,宜為5至720分鐘。小於5分鐘時,即使不使用本發明之製造方法亦可抑制不均一。比720分鐘長時,即使使用本發明之製造方法亦無法抑制不均一。保持時間可為5分鐘、100分鐘、200分鐘、300分鐘、400分鐘、500分鐘、600分鐘、720分鐘。
保持在加壓容器內之發泡性粒子通常立即施行發泡步驟,但是該立即係對應於藉保持含浸之環境氣體可有助於發泡性之時間,例如300秒以內。該時間可為250秒以內、200秒以內、150秒以內、100秒以內、50秒以內。
在發泡加熱步驟中,可使用習知預備發泡方法製造。以預備發泡方法之一例而言,使用95至125℃(例如,95℃、100℃、105℃、110℃、115℃、120℃、125℃)之水蒸氣等加熱介質加熱發泡性粒子,預備發泡至預定體積倍數,藉此獲得發泡粒子。
發泡粒子之體積倍數宜為5至70倍。體積倍數可為為5倍、10倍、20倍、30倍、40倍、50倍、60倍、70倍。更佳之體積倍數係10至60倍。
(複合樹脂種)
聚烯烴系樹脂沒有特別限制,可使用習知之樹脂。聚烯烴系樹脂亦可交聯。可舉例如:分枝狀低密度聚乙烯、直鏈狀低密度聚乙烯、中密度聚乙烯、高密度聚乙烯、乙烯-乙酸乙烯酯共聚物、乙烯-甲基丙烯酸甲酯共聚物、該等聚合物之交聯物等之聚乙烯系樹脂;丙烯單聚物、乙烯-丙烯無規共聚物、丙烯-1-丁烯共聚物、乙烯-丙烯-丁烯無規共聚物等之聚丙烯系樹脂。上述舉例說明中,低密度宜為0.91至0.94g/cm3,且更佳的是0.91至0.93g/cm3。高密度宜為0.95至0.97g/cm3,且更佳的是0.95至0.96g/cm3。中密度係該等低密度與高密度之中間密度。
聚苯乙烯系樹脂可舉聚苯乙烯、取代苯乙烯之聚合物(取代基上含有低級烷、鹵原子(特別是氯原子)等)、以苯乙烯為主成分且與可與苯乙烯共聚合之其他單體之共聚物等為例。主成分意味苯乙烯佔全部單體之70重量%以上(例如,70重量%以上、80重量%以上、90重量%以上、
100重量%)。取代苯乙烯可舉例如環苯乙烯類、p-甲基苯乙烯等之乙烯甲苯類、α-甲基苯乙烯等。其他單體,除了取代苯乙烯以外,可舉例如:丙烯腈、甲基丙烯腈、丙烯酸、甲基丙烯酸、丙烯酸烷酯、甲基丙烯酸烷酯、馬來酸單或二烷酯、二乙烯苯、乙二醇之單或二(甲基)丙烯酸酯、聚乙二醇二甲基丙烯酸酯、馬來酸酐、N-苯基馬來醯亞胺等。舉例說明中,烷基意味碳數1至8(例如,碳數1、2、3、4、5、6、7、8)之烷基。
複合樹脂宜包含聚烯烴系樹脂100重量份,及聚苯乙烯系樹脂120至560重量份。聚苯乙烯系樹脂之含量比560重量份多時,由發泡粒子獲得之發泡成形體之耐破裂性降低。另一方面,比120重量份少時,耐破裂性大幅提高,但是剛性降低。含量可為120重量份、200重量份、250重量份、300重量份、400重量份、450重量份、500重量份、560重量份。較佳之聚苯乙烯系樹脂含量係140至450重量份。
複合樹脂中亦可包含聚烯烴系樹脂及聚苯乙烯系樹脂以外之其他樹脂。其他樹脂可舉來自丙烯腈、甲基丙烯腈、丙烯酸、甲基丙烯酸、丙烯酸烷酯、甲基丙烯酸烷酯等之丙烯酸系單體的丙烯酸系樹脂為例。
(發泡性粒子)
發泡性粒子可藉由使發泡劑含浸到複合樹脂粒子來獲得。上述複合樹脂粒子係藉由在已分散保持有種子聚合用樹脂粒子(以下簡稱為種粒子)之水性介質中加入苯乙烯系單體,使苯乙烯系單體含浸於種粒子並聚合而獲得者。
(1)種粒子
複合樹脂粒子製造用之種粒子宜為在上述複合樹脂種之欄中說明之聚烯烴系樹脂粒子。更佳之樹脂粒子係聚乙烯系樹脂粒子。
種粒子可藉習知之方法獲得。例如,使用擠出機擠出聚烯烴系樹脂後,藉水中切割、束切割等造粒,可製作種粒子。種粒子可採用,例如,真球狀、橢圓球狀(卵狀)、圓柱狀、角柱狀、丸狀、粒狀等形狀。
種粒子中亦可含有自由基捕捉劑。自由基捕捉劑可預先添加於聚烯烴系樹脂中,或與熔融擠出同時地添加。自由基捕捉劑宜為具有捕捉聚合阻止劑(包含聚合抑制劑)、鏈轉移劑、氧化防止劑、受阻胺系光安定劑等之自由基之作用的化合物,且難溶於水。
聚合阻止劑可舉例如:三級丁基氫醌、對甲氧苯酚、2,4-二硝基苯酚、三級丁基兒茶酚、二級丙基兒茶酚、N-甲基-N-亞硝基苯胺、N-硝基苯羥胺、三亞膦酸苯酯、三(壬基亞膦酸苯酯)、三乙基苯酯、三亞膦酸乙酯、三亞膦酸(2-乙羥)酯、三亞膦酸癸酯、三亞膦酸(三癸)酯、二苯基單亞膦酸(2-乙羥)酯、二苯基單亞膦酸癸酯、二苯基單亞膦酸(三癸)酯、亞膦酸二(十二烷基)酯(dilauryl hydrogen phosphite)、二亞膦酸四苯丙二醇、四亞膦酸四苯四(三癸基)五赤藻醣醇等之苯酚系聚合阻止劑、亞硝系聚合阻止劑、芳香族胺系聚合阻止劑、亞磷酸酯系聚合阻止劑、硫醚系系聚合阻止劑等。
又,鏈轉移劑可舉例如:β-氫硫基丙酸2-乙己酯、二新戊四醇己六(3-氫硫丙酸酯)、三[(3-丙醯氧基)-乙基]異氰酸酯。
氧化防止劑可舉例如:2,6-二-三級丁基-4-甲基苯酚(BHT)、n-八癸基-3-(3,5-二-三級丁基-4-羥苯基)丙酸酯、新戊四基-四[3-(3,5-二-三級丁基-4-羥苯基)丙酸酯]、1,3,5-三-(3,5-二-三級丁基-4-羥苄基)異氰酸酯、1,3,5-三甲基-2,4,6-三(3,5-二-三級丁基-4-羥苄基)苯、3,9-雙[2-{3-(3-三級丁基-4-羥-5-甲基苯基)丙醯氧基}-1,1-二甲基乙基]-2,4,8,10-四氧雜螺環接[5.5]十一烷、二亞磷酸二硬脂醯新戊醇酯、亞磷酸三(2,4-二-三級丁苯基)酯、二亞磷酸雙(2,4-二-三級丁苯基)新戊醇酯、二亞磷酸四(2,4-二-三級丁苯基)4,4'-聯伸苯基酯、二亞磷酸雙(2-三級丁苯基-4-甲苯基)新戊醇酯、2,4,8,10-四-三級丁基-6-[3-(3-甲基-4-羥基-5-三級丁苯基)丙氧基]二苯[d.f][1,3,2]二氧雜磷、苯基-1-萘胺、辛基化二苯胺、4,4-雙(α,α-二甲基苄基)二苯胺、N,N'-二-2-萘基-p-伸苯二胺等之苯酚系氧化防止劑、磷酸系氧化防止劑、胺系氧化防止劑等。
受阻胺系光安定劑可舉例如:雙(2,2,6,6-四甲基-4-哌啶基)泌脂酸酯、雙(1,2,2,6,6-五甲基-4-哌啶基)泌脂酸酯、雙(1,2,2,6,6-五甲基-4-哌啶基)2-(3,5-二-三級丁基-4-甲基苄基)-2-n-丁基丙二酸酯等。
自由基捕捉劑之使用量宜相對於種粒子100重量份為0.005至0.5重量份。使用量可為0.005重量份、0.1重量份、
0.2重量份、0.3重量份、0.4重量份、0.5重量份。
此外,種粒子亦可包含滑石、矽酸鈣、硬脂酸鈣、合成或天然產生之二氧化矽、伸乙雙硬脂酸醯胺、甲基丙烯酸系酯系共聚物等之發泡核劑、六溴環十二烷、三芳基異氰酸酯6溴化物等之難燃劑等。
(2)複合樹脂粒子
複合樹脂粒子係藉由使種粒子分散在聚合容器內之水性介質中,且一面使苯乙烯系單體含浸於種粒子中一面聚合而獲得。
水性介質可舉水、水與水溶性溶劑(例如,乙醇)之混合介質為例。
苯乙烯系單體中亦可添加甲苯、二甲苯、環己烷、乙酸乙酯、苯二甲酸二辛酯、四氯乙烯等之溶劑(可塑劑)。
苯乙烯系單體之使用量實質地對應於構成發泡成形體之聚烯烴系樹脂及聚苯乙烯系樹脂之含量。
苯乙烯系單體對種粒子之含浸可一面聚合一面進行,亦可在開始聚合前進行。其中,較佳的是一面聚合一面進行。又,含浸後進行聚合時,容易在種粒子之表面附近產生苯乙烯系單體之聚合,且,有時未含浸於種粒子中之苯乙烯系單體單獨地聚合,生成大量微粒子狀之聚苯乙烯系樹脂粒子。
苯乙烯系單體之聚合可使用油溶性自由基聚合起始劑。該聚合起始劑可使用通用於苯乙烯系單體之聚合起始劑。可舉例如:過氧化苯甲醯、過氧化月桂醯、過氧
辛酸三級丁酯、過氧辛酸三級己酯、過氧苯甲酸三級丁酯、過氧戊酸三級丁酯、過氧新戊酸三級丁酯、過氧異丙基碳酸三級丁酯、過氧異丙基碳酸三級己酯、過氧-3,3,5-三甲基環己酸三級丁酯、過氧六氫對苯二甲酸二(三級丁酯)、過氧丁酸2,2-二(三級丁酯)、二(三級己基)過氧化物、二異丙苯基過氧化物等之有機過氧化物、偶氮雙異丁腈、偶氮雙二甲基戊腈等之偶氮化合物。又,該等油溶性自由基聚合起始劑可單獨使用,亦可併用。
在聚合容器內之水性溶劑中添加聚合起始劑之方法可舉各種方法為例。例如,(a)在與聚合容器不同之容器內使苯乙烯系單體中溶解且含有聚合起始劑,且供給該苯乙烯系單體至聚合容器內之方法,(b)使聚合起始劑溶解於苯乙烯系單體之一部份、異烷烴等之溶劑或可塑劑中而製作溶液。將該溶液及預定量之苯乙烯系單體同時供給至聚合容器內之方法,(c)製作使聚合起始劑散於水性介質之分散液。將該分散液及苯乙烯系單體供給至聚合容器內之方法等。
上述聚合起始劑之使用比例宜添加通常苯乙烯系單體使用總量之0.02至2.0重量%。添加量可為0.02重量%、0.5重量%、1.0重量%、1.5重量%、2.0重量%。
水性介質中宜先溶解水溶性自由基聚合阻止劑。因為水溶性自由基聚合阻止劑不僅可抑制種粒子表面中苯乙烯系單體之聚合,亦可防止浮遊於水性介質中之苯乙烯
系單體單獨地聚合,減少聚苯乙烯系樹脂之微粒子生成。
水溶性自由基聚合阻止劑可使用相對水100g溶解1g以上之聚合阻止劑,且可舉例如:硫氰酸銨、硫氰酸鋅、硫氰酸鈉、硫氰酸鉀、硫氰酸鋁等之硫氰酸鹽,亞硝酸鈉、亞硝酸鉀、亞硝酸銨、亞硝酸鈣、亞硝酸銀、亞硝酸鍶、亞硝酸銫、亞硝酸鋇、亞硝酸鎂、亞硝酸鋰、亞硝酸二環己銨等之亞硝酸鹽,巰乙醇、單硫丙二醇、硫甘油、硫乙二醇、硫代氫丙烯酸、硫代乳酸、巰丁二酸、巰乙醇胺、1,2-二硫甘油、1,3-二硫甘油等含水溶性離子有機化合物,及抗壞血酸、抗壞血酸鈉等。
上述水溶性自由基聚合阻止劑之使用量宜相對水性介質中之水100重量份為0.001至0.04重量份。使用量可為0.001重量份、0.01重量份、0.015重量份、0.02重量份、0.025重量份、0.03重量份、0.035重量份、0.04重量份。
又,宜於上述水性介質中先添加分散劑。如此之分散劑可舉例如:部份皂化聚乙烯醇、聚丙烯酸鹽、聚乙烯吡咯啶酮、羧甲基纖維素、甲基纖維素等之有機系分散劑,二氫吡咯酸鎂、二氫吡咯酸鈣、磷酸鈣、羥磷灰石、碳酸鈣、磷酸鎂、碳酸鎂、氧化鎂等無機系分散劑。
使用無機系分散劑時,宜併用界面活性劑。如此之界面活性劑可舉十二烷苯磺酸鈉、α-烯烴磺酸鈉等為例。
又,使苯乙烯系單體聚合於種粒子中時之水性介質溫度沒有特別限制,但是宜在使用之聚烯烴系樹脂熔點(藉依據JIS K 7121-1987之DSC法測量之峰值)之-30至+20
℃的範圍內。溫度可採用熔點之-30℃、-20℃、-10℃、0℃、+10℃、+20℃。更具體而言,宜為70至140℃(例如,70℃、90℃、120℃、140℃),且更佳的是80至130℃。又,水性介質之溫度在由苯乙烯系單體之聚合開始至結束間,可為一定溫度,亦可階段地上升。使水性介質溫度上升時,宜以0.1至2℃/分之升溫速度上升。
又,使用由交聯之聚烯烴系樹脂構成之種粒子時,交聯可在含浸苯乙烯系單體前預先進行,可在含浸、聚合苯乙烯系單體於種粒子中時進行,亦可在含浸、聚合苯乙烯系單體於種粒子中後進行。
聚烯烴系樹脂之交聯用之交聯劑可舉例如:過氧丁酸2,2-二(三級丁酯)、二異丙苯基過氧化物、過氧己酸2,5-二甲基-2,5-二(三級丁酯)等之有機過氧化物。又,交聯劑可單獨使用亦可併用2種以上。此外,交聯劑之使用量,通常,宜相對種粒子100重量份為0.05至2.0重量份。
添加交聯劑之方法可舉例如:直接添加於種粒子之方法,使交聯劑溶解於溶劑、可塑劑或苯乙烯系單體中後添加之方法,使交聯劑分散於水中後添加之方法等。其中,較佳的是使交聯劑分散於水中後添加之方法。
藉上述方法獲得複合樹脂粒子。
(3)發泡劑之含浸
發泡性粒子可藉由在水性介質中使發泡劑含浸到複合樹脂粒子之方法(濕式含浸法),或在不存在水性介質下含浸之方法(乾式含浸法)獲得。在前者之情形下,亦可同時地
進行複合樹脂粒子製造時之單體之聚合步驟及發泡劑之含浸步驟。發泡性粒子製造後之發泡劑之含浸量宜為6至12重量%。含浸量可為6重量%、8重量%、10重量%、12重量%。
發泡劑沒有特別限制,且均可使用習知者。沸點在聚苯乙烯系樹脂之軟化點以下,且在常壓下程氣體狀或液狀之有機化合物特別適合。可舉例如:丙烷、正丁烷、異丁烷、正戊烷、異戊烷、新戊烷、環戊烷、環戊二烯、正己烷、石油醚等之碳氫化合物,丙酮、丁酮等酮類,甲醇、乙醇、異丙醇等醇類,二甲醚、二乙醚、二丙醚、甲基乙基醚等之低沸點醚化合物,二氧化碳、氮、氨等之無機氣體等。該等發泡劑可單獨地使用,亦可併用2種以上。
又,發泡性粒子中亦可含有發泡劑與發泡助劑及可塑劑等。
發泡助劑可舉例如:苯乙烯、甲苯、乙苯、二甲苯等之芳香族化合物,環己烷、甲基環己烷等之環式脂肪族碳氫化合物,乙酸乙酯、乙酸丁酯等在1大氣壓下沸點為200℃以下之溶劑。發泡助劑在發泡性粒子中之含量通常係0.1至2.0重量%。該含量可為0.1、0.5、1.0、1.5、2.0重量%。
可塑劑可舉二異丁基己二酸酯、二乙醯化單月桂酸酯、椰子油等為例。又,該等可塑劑亦具有作為發泡助劑之機能。
(B)發泡粒子之製造裝置
依據本發明,提供製造上述發泡粒子所使用之發泡粒
子之製造裝置。如果發泡粒子之製造裝置可獲得上述發泡粒子,其構成沒有特別限制。例如,發泡粒子之製造裝置包含保持發泡性粒子之加壓容器,使發泡性粒子發泡之發泡容器,由加壓容器搬送至發泡容器之裝置。
加壓容器通常具有可密閉之耐壓構造,且具有發泡粒子之製造中,用以維持內壓及內溫於0.1至0.4MPa及-20至30℃之裝置。藉具有該裝置,可提供抑制在每一批次之體積倍數之不均一的發泡粒子。
用以維持內壓之裝置可舉壓力計及環境氣體之壓入裝置的組合為例。依據壓力計之測量值,可由壓入裝置將環境氣體壓入加壓容器。又,用以維持內溫之裝置可舉溫度計及恆溫裝置之組合為例。依據溫度計之測量值,可藉由恆裝置調整溫度。
由加壓容器搬送發泡性粒子至發泡容器之裝置沒有特別限制。可舉藉由將加壓容器配置於比發泡容器高之地方,利用重力之裝置,及利用空氣壓力之裝置等為例。
發泡容器之構造沒有特別限制,但是具有用以使發泡性粒子發泡之加熱介質之導入口。
發泡粒子之製造裝置亦可依需要具有搬送發泡性粒子至加壓容器之裝置,由加壓容器搬送發泡粒子之裝置。
(C)發泡粒子
依據本發明,提供抑制在發泡步驟之每一不同批次獲得之發泡粒子間之體積倍數的不均一在3.0倍以內之發泡粒子。體積倍數不均一之發泡粒子,為均一地維持發泡成
形體之各種物性,必須依據發泡粒子之體積倍數調整發泡成形體之製造條件。發泡粒子及發泡成形體之製造有時在不同選定用地之工廠進行,或由不同企業家進行,因此具有發泡成形體製造時需個別地調整其條件之大缺點。本發明之發泡粒子大幅抑制如此不均一,因此可減少該缺點。
實施例
以下,舉例地進一步說明實施例,但是本發明不限於該等實施例。
(發泡粒子之體積倍數)
以小數點以下2位秤量大約5g之發泡粒子之重量(a)。接著,放入在最小刻度單位為5cm3之500cm3量筒中秤量之發泡粒子,將比量筒口徑稍小之圓形樹脂板,即其中心寬度大約1.5cm、長度大約30cm之棒直立固定之按壓工具放在該發泡粒子上,讀取發泡粒子之體積(b),且藉由式(a)/(b)求出發泡粒子之體密度(g/cm3)。又,體積倍數係體密度之倒數,即,式(b)/(a)。
(發泡不均一)
逐批地測量發泡粒子之體積倍數。以由20批之最大體積倍數減去最小體積倍數之值作為發泡不均一R。R≦3.0評價為○(良好),3.0<R評價為×(不良)。
(外觀評價)
外觀評價係以發泡粒子最表面層之氣泡徑評價。
將發泡粒子切割成2份,且使用掃描式電子顯微鏡(Hitachi High-Technologies公司製,型式:S-3000N)將切割
成2份之切片的截面放大至15至30倍且攝影。
將攝得之影像逐一地印刷在A4用紙上,且對發泡粒子最表層之任意氣泡,以攝影之縮尺為基礎,測量其長徑及短徑之長度(μm)。
由測量結果藉由下式算出氣泡徑d。
氣泡徑d=(長徑+短徑)/2(μm)
對1個發泡粒子重覆上述操作10個,且以10個發泡粒子之算術平均值為平均氣泡徑D(μm)。
評價發泡粒子之外觀如下。
○(良好):發泡粒子最表面層之平均氣泡徑D在50至500μm之範圍內。
×(不良):發泡粒子最表面層之平均氣泡徑D包含上述範圍外之粒子。
實施例1
(種子聚合用聚乙烯系樹脂粒子:種粒子之製作)
藉擠出機擠出乙烯-乙酸乙酯共聚物樹脂粒子(ASAHI KASEI公司製,製品名「Suntec EF0510」,熔流速率1.1g/10分,密度0.92g/cm3,熔點105℃,乙烯量95質量%),且在水流中切斷獲得之擠出物,藉此獲得800μg/粒之大略狀種子聚合用聚乙烯系樹脂粒子。又,造粒時相對前述聚合用聚乙烯系樹脂粒子100質量份添加0.5質量份之滑石,作為氣泡調整劑。
(複合樹脂粒子之製作)
將該上述種子聚合用聚乙烯系樹脂粒子15kg放入具攪
拌機之內容積100公升耐壓容器中,添加純水40kg、二氫吡咯酸鎂200g、十二烷苯磺酸鈉7g,攪拌且使之在水性介質中懸浮,保持10分鐘,然後升溫至60℃而成為水系懸浮液。接著,以30分滴下在該懸浮液中溶解二異丙苯基過氧化物8g之苯乙烯7kg。滴下後保持30分,使聚乙烯系樹脂粒子吸收苯乙烯。吸收後以1℃/分之速度升溫至130℃,且在該溫度進行1小時30分聚合。然後,降低至90℃之溫度,且在該懸浮液中,以4小時滴下溶解過氧化苯甲醯78g、過氧苯甲酸三級丁酯7.8g作為聚合起始劑及二異丙苯基過氧化物115g作為交聯劑之苯乙烯17kg,且添加乙烯雙脂肪酸醯胺120g,使之吸收至乙烯乙酸乙酯共聚物樹脂粒子中後進行聚合。該滴下結束後,在90℃保持1小時後以1℃/分之速度升溫至140℃且保持2小時30分後結束聚合,接著以1℃/分之速度冷卻至常溫而獲得複合樹脂粒子。
(發泡性粒子之製造方法)
以內容積50公升之耐壓且可密閉混合器作為含浸反應容器,投入上述複合樹脂粒子20kg,且密閉後使其旋轉並且壓入丁烷(正丁烷:異丁烷=7:3,質量比,以下同)5000g。接著,升溫至70℃之溫度且維持4小時含浸丁烷後,冷卻至30℃後獲得發泡性粒子。
(發泡粒子之製造方法)
將上述發泡性粒子取出至加壓容器,且利用批式預備發泡機進行發泡至預定體積倍數,但是因為在取出至開放系時作為發泡劑之丁烷開始散逸,故以由加壓容器經過測
量器投入至發泡容器(批式預備發泡機)作為閉鎖系,測量每1批次,且每次測量時將氮氣壓入加壓容器內使加壓容器內之壓力固定為0.3MPa、溫度固定為30℃,且進行發泡。又,粒子由加壓容器至預備發泡機內之移動為180秒以內,且到第20次之發泡性粒子由加壓容器取出為止之時間(保持時間)係100分。
如此,以1批次之投入量為1kg,且在管內容積50公升之預備發泡機內在水蒸氣中發泡至體積倍數30倍,且重覆進行20次發泡,獲得發泡粒子。
實施例2
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.2MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例3
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.15MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例4
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.4MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例5
除了將二氧化碳壓入加壓容器內且使加壓容器內之壓力固定為0.3MPa而實施發泡以外,與實施例1同樣地獲得發
泡粒子。
實施例6
除了將丁烷壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例7
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa、溫度固定為-20℃而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例8
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa、溫度固定為0℃而實施發泡以外,與實施例1同樣地獲得發泡粒子。
實施例9
(種子聚合用聚乙烯系樹脂粒子之製作)
藉擠出機擠出直鏈狀低密度聚乙烯系樹脂粒子(JAPAN POLYETHYLENE公司製,製品名「NF-444A」,熔流速率2.0g/10分,密度0.912g/cm3,熔點121℃),且在水流中切斷獲得之擠出物,藉此獲得400μg/粒之大略狀種子聚合用聚乙烯系樹脂粒子。又,造粒時相對前述聚合用聚乙烯系樹脂粒子100質量份添加0.5質量份之滑石,作為氣泡調整劑。
(複合樹脂粒子之製作)
在內容積100公升高壓釜中,添加純水40kg、二氫吡咯
酸鎂200g作為分散劑、十二烷苯磺酸鈉20g作為界面活性劑而作成水性介質,使上述種子聚合用聚乙烯系樹脂粒子14kg懸浮,且以轉數150rpm攪拌。
在其中添加包含苯乙烯7kg(相對種子聚合用聚乙烯系樹脂粒子200質量份為100質量份)及二異丙苯基過氧化物21g作為聚合起始劑之混合液,在60℃之溫度放置60分鐘,使苯乙烯含浸於種子聚合用聚乙烯系樹脂粒子中。接著,升溫至130℃聚合3小時。然後,降低至115℃之溫度,且以4小時添加包含苯乙烯17kg及過氧苯甲酸三級丁酯(TBPB)100g作為聚合起始劑之混合液,藉此一面使苯乙烯含浸於種子聚合用聚乙烯系樹脂粒子一面進行聚合。然後,升溫至140℃且維持2小時,強制聚合殘存單體而使之減少後,冷卻而獲得複合樹脂粒子。
(發泡性粒子之製造方法)
以內容積50公升之耐壓且可密閉混合器作為含浸反應容器,投入上述複合樹脂粒子20kg,且密閉後使其旋轉並且壓入丁烷(正丁烷:異丁烷=7:3,質量比,以下同)5000g。接著,升溫至70℃之溫度且維持4小時含浸丁烷後,冷卻至30℃後獲得發泡性粒子。
(發泡粒子之製造方法)
將上述發泡性粒子取出至加壓容器,且利用批式預備發泡機進行發泡至預定體積倍數,但是因為在取出至開放系時作為發泡劑之丁烷開始散逸,故以由加壓容器經過測量器投入至發泡容器(批式預備發泡機)作為閉鎖系,測量每
1批次,且每次測量時將氮氣壓入加壓容器內使加壓容器內之壓力固定為0.3MPa、溫度固定為30℃,且進行發泡。
如此,以1批次之投入量為1kg,且在管內容積50公升之預備發泡機內在水蒸氣中發泡至體積倍數50倍,且重覆進行20次發泡,獲得發泡粒子。又,粒子由加壓容器至預備發泡機內之移動為180秒以內,且到第20次之發泡性粒子由加壓容器取出為止之時間(保持時間)係120分。
實施例10
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.2MPa而實施發泡以外,與實施例9同樣地獲得發泡粒子。
實施例11
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.15MPa而實施發泡以外,與實施例5同樣地獲得發泡粒子。
實施例12
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.4MPa而實施發泡以外,與實施例9同樣地獲得發泡粒子。
實施例13
除了將二氧化碳壓入加壓容器內且使加壓容器內之壓力固定為0.3MPa而實施發泡以外,與實施例9同樣地獲得發泡粒子。
實施例14
除了將丁烷壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa而實施發泡以外,與實施例9同樣地獲得發泡粒子。
實施例15
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa、溫度固定為-20℃而實施發泡以外,與實施例9同樣地獲得發泡粒子。
實施例16
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa、溫度固定為0℃而實施發泡以外,與實施例9同樣地獲得發泡粒子。
比較例1
除了在不將氮氣壓入加壓容器內之情形下實施發泡以外,與實施例1同樣地獲得發泡粒子。
比較例2
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.05MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
比較例3
除了將丁烷壓入加壓容器內且使加壓容器內之壓力固定為0.1MPa、溫度固定為-25℃而實施發泡以外,與實施例1同樣地獲得發泡粒子。
比較例4
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固
定為0.2MPa、溫度固定為40℃而實施發泡以外,與實施例1同樣地獲得發泡粒子。
比較例5
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.45MPa而實施發泡以外,與實施例1同樣地獲得發泡粒子。
比較例6
除了在不將氮氣壓入加壓容器內之情形下實施發泡以外,與實施例9同樣地獲得發泡粒子。
比較例7
除了將氮氣壓入加壓容器內且使加壓容器內之壓力固定為0.05MPa而實施發泡以外,與實施例9同樣地獲得發泡粒子。
於上述實施例及比較例之加壓容器內賦予壓力之氣體種類、加壓容器內壓、每批次之發泡粒子之體積倍數、體積倍數之不均一、外觀評價及綜合評價顯示於表1至3中。
由實施例及比較例可了解,當將在1批次中獲得之發泡性粒子分成多數批次地發泡時,藉由在特定壓力及溫度下保持發泡性粒子,可顯著地抑制發泡粒子之批次間之體積倍數不均一。
Claims (7)
- 一種發泡粒子之製造方法,係將含有基材樹脂與發泡劑之發泡性粒子至少分成2次以上地施行發泡步驟,該基材樹脂為聚烯烴系樹脂與聚苯乙烯系樹脂之複合樹脂;並且,前述發泡性粒子係經保持在加壓容器內之後方施行前述發泡步驟,該加壓容器則維持0.1至0.4MPa及-20至30℃。
- 如請求項1之發泡粒子之製造方法,其中前述發泡性粒子係保持在充滿環境氣體之加壓容器內,該環境氣體包含氮或丁烷。
- 如請求項1之發泡粒子之製造方法,其中前述發泡性粒子係保持在加壓容器內5至720分鐘。
- 如請求項1之發泡粒子之製造方法,其中前述發泡性粒子係藉由1次之發泡劑含浸步驟獲得,且前述發泡步驟進行2至200次。
- 如請求項1之發泡粒子之製造方法,其中發泡性粒子係施行每次1至50kg之發泡步驟。
- 一種發泡粒子之製造裝置,係用於製造如請求項1之發泡粒子;該製造裝置具有用以保持發泡性粒子之加壓容器、使發泡性粒子發泡之發泡容器、及將發泡性粒子從前述加壓容器搬送至發泡容器之機構;並且,前述加壓容器具有用以使內壓及內溫維持在 0.1至0.4MPa及-20至30℃之機構。
- 一種發泡粒子,係以如請求項1之方法製得;並且,在不同發泡步驟中所得發泡粒子間之體積倍數之偏差已抑制在3.0倍以內。
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| EP (1) | EP2980144A4 (zh) |
| JP (1) | JP5957599B2 (zh) |
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| NL264938A (zh) * | 1961-05-18 | |||
| JPS5712035A (en) * | 1980-06-25 | 1982-01-21 | Japan Styrene Paper Co Ltd | Production of polyolefin resin molded foam |
| JPS58101025A (ja) * | 1981-12-09 | 1983-06-16 | Japan Styrene Paper Co Ltd | ポリオレフイン系樹脂予備発泡粒子の加圧処理方法 |
| JPS61238250A (ja) | 1985-04-15 | 1986-10-23 | 日本炭酸瓦斯株式会社 | 軽便型酸素補吸器 |
| JP2001212841A (ja) * | 2000-02-01 | 2001-08-07 | Kanegafuchi Chem Ind Co Ltd | ポリオレフィン系合成樹脂の型内発泡成形方法及び型内発泡成形装置 |
| JP4721385B2 (ja) * | 2001-07-02 | 2011-07-13 | キヤノン株式会社 | 射出成形機への樹脂材料の供給方法及び装置 |
| JP2007503324A (ja) * | 2003-08-15 | 2007-02-22 | ノバ・ケミカルズ(インターナシヨナル)・エス・アー | 発泡性ポリマー粒子およびその発泡物品を加工する方法 |
| JP2005281595A (ja) * | 2004-03-30 | 2005-10-13 | Sekisui Plastics Co Ltd | スチレン改質ポリオレフィン系樹脂粒子、発泡性樹脂粒子、予備発泡樹脂粒子、発泡成形体及びスチレン改質ポリオレフィン系樹脂粒子の製造方法 |
| JP5337442B2 (ja) * | 2008-09-30 | 2013-11-06 | 積水化成品工業株式会社 | 発泡成形体、およびその製造方法 |
| JP5192420B2 (ja) * | 2009-03-03 | 2013-05-08 | 積水化成品工業株式会社 | 長期保存用発泡性複合樹脂粒子、その予備発泡粒子及び発泡成形体 |
| JP5453923B2 (ja) * | 2009-05-20 | 2014-03-26 | 株式会社ジェイエスピー | 改質樹脂発泡粒子及びその成形体 |
| JP5629689B2 (ja) * | 2009-09-11 | 2014-11-26 | 積水化成品工業株式会社 | 発泡性複合樹脂粒子、その製造方法、予備発泡粒子および発泡成形体 |
| WO2011122081A1 (ja) * | 2010-03-30 | 2011-10-06 | 積水化成品工業株式会社 | 冷凍保存用発泡性複合樹脂粒子 |
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| EP2980144A1 (en) | 2016-02-03 |
| CN105026473B (zh) | 2018-06-12 |
| US20160009890A1 (en) | 2016-01-14 |
| EP2980144A4 (en) | 2016-12-14 |
| JP5957599B2 (ja) | 2016-07-27 |
| JPWO2014157643A1 (ja) | 2017-02-16 |
| TW201446848A (zh) | 2014-12-16 |
| CN105026473A (zh) | 2015-11-04 |
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