JP5596509B2 - Method for producing open cell cross-linked polyolefin resin foam - Google Patents
Method for producing open cell cross-linked polyolefin resin foam Download PDFInfo
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- JP5596509B2 JP5596509B2 JP2010258891A JP2010258891A JP5596509B2 JP 5596509 B2 JP5596509 B2 JP 5596509B2 JP 2010258891 A JP2010258891 A JP 2010258891A JP 2010258891 A JP2010258891 A JP 2010258891A JP 5596509 B2 JP5596509 B2 JP 5596509B2
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- 239000006260 foam Substances 0.000 title claims description 101
- 229920005672 polyolefin resin Polymers 0.000 title claims description 56
- 238000004519 manufacturing process Methods 0.000 title claims description 22
- 238000007906 compression Methods 0.000 claims description 84
- 230000006835 compression Effects 0.000 claims description 53
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 210000004027 cell Anatomy 0.000 description 52
- 238000012360 testing method Methods 0.000 description 23
- 238000007789 sealing Methods 0.000 description 20
- 238000005187 foaming Methods 0.000 description 17
- 239000002994 raw material Substances 0.000 description 17
- 239000003431 cross linking reagent Substances 0.000 description 16
- 238000004132 cross linking Methods 0.000 description 14
- 239000004088 foaming agent Substances 0.000 description 10
- 239000006261 foam material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 229920006026 co-polymeric resin Polymers 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
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- 235000019399 azodicarbonamide Nutrition 0.000 description 3
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- 239000003566 sealing material Substances 0.000 description 3
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 150000001336 alkenes Chemical class 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 235000014113 dietary fatty acids Nutrition 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
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- 229930195729 fatty acid Natural products 0.000 description 2
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- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 description 2
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- GRPURDFRFHUDSP-UHFFFAOYSA-N tris(prop-2-enyl) benzene-1,2,4-tricarboxylate Chemical compound C=CCOC(=O)C1=CC=C(C(=O)OCC=C)C(C(=O)OCC=C)=C1 GRPURDFRFHUDSP-UHFFFAOYSA-N 0.000 description 2
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- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 2
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 description 1
- YXUGBTHHXGQXPO-UHFFFAOYSA-N 1-tert-butylperoxy-3-(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC1=CC=CC(C(C)(C)OOC(C)(C)C)=C1 YXUGBTHHXGQXPO-UHFFFAOYSA-N 0.000 description 1
- CWJHMZONBMHMEI-UHFFFAOYSA-N 1-tert-butylperoxy-3-propan-2-ylbenzene Chemical compound CC(C)C1=CC=CC(OOC(C)(C)C)=C1 CWJHMZONBMHMEI-UHFFFAOYSA-N 0.000 description 1
- 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 1
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 description 1
- SAPGBCWOQLHKKZ-UHFFFAOYSA-N 6-(2-methylprop-2-enoyloxy)hexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCOC(=O)C(C)=C SAPGBCWOQLHKKZ-UHFFFAOYSA-N 0.000 description 1
- YJVIKVWFGPLAFS-UHFFFAOYSA-N 9-(2-methylprop-2-enoyloxy)nonyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCCCCCCCCCOC(=O)C(C)=C YJVIKVWFGPLAFS-UHFFFAOYSA-N 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- OKJADYKTJJGKDX-UHFFFAOYSA-N Butyl pentanoate Chemical compound CCCCOC(=O)CCCC OKJADYKTJJGKDX-UHFFFAOYSA-N 0.000 description 1
- 239000004641 Diallyl-phthalate Substances 0.000 description 1
- QOSMNYMQXIVWKY-UHFFFAOYSA-N Propyl levulinate Chemical compound CCCOC(=O)CCC(C)=O QOSMNYMQXIVWKY-UHFFFAOYSA-N 0.000 description 1
- ULQMPOIOSDXIGC-UHFFFAOYSA-N [2,2-dimethyl-3-(2-methylprop-2-enoyloxy)propyl] 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(C)(C)COC(=O)C(C)=C ULQMPOIOSDXIGC-UHFFFAOYSA-N 0.000 description 1
- ZOIORXHNWRGPMV-UHFFFAOYSA-N acetic acid;zinc Chemical compound [Zn].CC(O)=O.CC(O)=O ZOIORXHNWRGPMV-UHFFFAOYSA-N 0.000 description 1
- 125000005396 acrylic acid ester group Chemical group 0.000 description 1
- 239000002671 adjuvant Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QUDWYFHPNIMBFC-UHFFFAOYSA-N bis(prop-2-enyl) benzene-1,2-dicarboxylate Chemical compound C=CCOC(=O)C1=CC=CC=C1C(=O)OCC=C QUDWYFHPNIMBFC-UHFFFAOYSA-N 0.000 description 1
- WXCZUWHSJWOTRV-UHFFFAOYSA-N but-1-ene;ethene Chemical compound C=C.CCC=C WXCZUWHSJWOTRV-UHFFFAOYSA-N 0.000 description 1
- MPMBRWOOISTHJV-UHFFFAOYSA-N but-1-enylbenzene Chemical compound CCC=CC1=CC=CC=C1 MPMBRWOOISTHJV-UHFFFAOYSA-N 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- FOTKYAAJKYLFFN-UHFFFAOYSA-N decane-1,10-diol Chemical compound OCCCCCCCCCCO FOTKYAAJKYLFFN-UHFFFAOYSA-N 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- UQLDLKMNUJERMK-UHFFFAOYSA-L di(octadecanoyloxy)lead Chemical compound [Pb+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O UQLDLKMNUJERMK-UHFFFAOYSA-L 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 125000004494 ethyl ester group Chemical group 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- PYGSKMBEVAICCR-UHFFFAOYSA-N hexa-1,5-diene Chemical group C=CCCC=C PYGSKMBEVAICCR-UHFFFAOYSA-N 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- OCWMFVJKFWXKNZ-UHFFFAOYSA-L lead(2+);oxygen(2-);sulfate Chemical compound [O-2].[O-2].[O-2].[Pb+2].[Pb+2].[Pb+2].[Pb+2].[O-]S([O-])(=O)=O OCWMFVJKFWXKNZ-UHFFFAOYSA-L 0.000 description 1
- UMKARVFXJJITLN-UHFFFAOYSA-N lead;phosphorous acid Chemical compound [Pb].OP(O)O UMKARVFXJJITLN-UHFFFAOYSA-N 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 235000019359 magnesium stearate Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000004702 methyl esters Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- DCKVNWZUADLDEH-UHFFFAOYSA-N sec-butyl acetate Chemical compound CCC(C)OC(C)=O DCKVNWZUADLDEH-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000004246 zinc acetate Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 1
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Description
本発明は、低圧縮歪性及びシール性に優れた連続気泡架橋ポリオレフィン系樹脂発泡体を製造するための製造方法に関する。 The present invention relates to a production method for producing an open-cell crosslinked polyolefin resin foam excellent in low compression strain and sealing properties.
連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法として、独立気泡架橋ポリオレフィン系樹脂発泡体に対して、異方向に回転する２本のロール間隙を通過させて圧縮する圧縮処理を行うことにより、気泡膜を破裂させて気泡を連通化させる方法が知られている（例えば、特許文献１）。特許文献１の製造方法では、独立気泡架橋ポリオレフィン系樹脂発泡体として、発泡倍率が１５〜７０倍であり、平均気泡径のゲル分率に対する比が１０〜３００の関係あるポリオレフィン系樹脂発泡体を用いている。そして、圧縮処理における発泡体の圧縮率を８７．５〜９６％とし、ロールの周速比を１．０〜１．４としている。このように構成することで、発泡倍率及び連続気泡率が高く、表面が平滑な連続気泡架橋ポリオレフィン系樹脂発泡体を得ることができる。 As a method for producing an open-cell cross-linked polyolefin resin foam, a closed-cell cross-linked polyolefin resin foam is subjected to a compression process in which it is compressed by passing through a gap between two rolls rotating in different directions. A method is known in which bubbles are communicated by causing bubbles to communicate (for example, Patent Document 1). In the production method of Patent Document 1, as a closed cell crosslinked polyolefin resin foam, a polyolefin resin foam having a foaming ratio of 15 to 70 times and a ratio of an average cell diameter to a gel fraction of 10 to 300 is used. Used. And the compression rate of the foam in a compression process shall be 87.5-96%, and the peripheral speed ratio of the roll shall be 1.0-1.4. By comprising in this way, the open cell bridge | crosslinking polyolefin resin foam with a high foaming ratio and an open cell rate, and a smooth surface can be obtained.
ところで、連続気泡架橋ポリオレフィン系樹脂発泡体をシール材として用いる場合には、高いシール性に加えて低圧縮歪性が求められるが、特許文献１の製造方法では低圧縮歪性及び高いシール性を有する連続気泡架橋ポリオレフィン系樹脂発泡体を得ることは困難であった。特許文献１の製造方法を用いて、シール性の高い（気泡の細かい）連続気泡架橋ポリオレフィン系樹脂発泡体を得ようとした場合、気泡径に合わせてゲル分率を下げる必要があるが、ゲル分率を下げると樹脂強度が低下してしまい低圧縮歪性を得ることができなくなる。また、低圧縮歪性を求めてゲル分率を高めた場合、ゲル分率に合わせて気泡径が大きくなってしまうことから、高いシール性を得ることができなくなる。 By the way, when using an open-cell crosslinked polyolefin resin foam as a sealing material, low compressive strain is required in addition to high sealing properties. However, the manufacturing method of Patent Document 1 has low compressive strain and high sealing properties. It was difficult to obtain an open-cell crosslinked polyolefin resin foam having the same. When trying to obtain an open cell crosslinked polyolefin resin foam having high sealing properties (fine bubbles) using the production method of Patent Document 1, it is necessary to lower the gel fraction in accordance with the cell diameter. When the fraction is lowered, the resin strength is lowered and low compression strain cannot be obtained. In addition, when the gel fraction is increased in order to obtain low compressive strain, the bubble diameter increases in accordance with the gel fraction, so that high sealing performance cannot be obtained.
この発明は、こうした従来の実情に鑑みてなされたものであり、その目的は、低圧縮歪性及びシール性に優れた連続気泡架橋ポリオレフィン系樹脂発泡体を製造するための製造方法を提供することにある。 The present invention has been made in view of such conventional circumstances, and an object of the present invention is to provide a production method for producing an open-cell crosslinked polyolefin resin foam excellent in low compression strain and sealability. It is in.
上記の目的を達成するために請求項１に記載の連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法は、独立気泡架橋ポリオレフィン系樹脂発泡体に対し、異方向へ回転する２本のロール間隙を通過させて圧縮する圧縮処理を行うことにより気泡を連通させて連続気泡架橋ポリオレフィン系樹脂発泡体を製造する方法であって、ポリオレフィン系樹脂、発泡剤、及び架橋剤を含有する発泡体原料を反応及び発泡させてなり、ＪＩＳ Ｋ６７６７に規定される引張強さと、ＪＩＳ Ｋ６７６７に規定される２５ｍｍあたりの平均セル数との積として得られる第１の値が４．５以上である独立気泡架橋ポリオレフィン系樹脂発泡体を用い、前記圧縮処理を複数回繰り返し行う圧縮工程を有し、該圧縮工程において、前記ロールの周速比と圧縮率との積を圧縮処理毎に算出し、それを総和した値を第２の値としたとき、前記第２の値を前記第１の値で除した値として得られる第３の値が１００〜２９０の範囲であることを特徴とする。 In order to achieve the above object, the method for producing an open-cell crosslinked polyolefin resin foam according to claim 1 passes through two roll gaps rotating in different directions with respect to the closed-cell crosslinked polyolefin resin foam. A method of producing an open-cell crosslinked polyolefin-based resin foam by allowing bubbles to communicate by performing a compression treatment, wherein the foam raw material containing a polyolefin-based resin, a foaming agent, and a crosslinking agent is reacted and Closed-cell cross-linked polyolefin resin obtained by foaming and having a first value of 4.5 or more as a product of the tensile strength defined in JIS K6767 and the average number of cells per 25 mm defined in JIS K6767 Using a foam, and having a compression step of repeatedly performing the compression treatment a plurality of times, in the compression step, between the peripheral speed ratio of the roll and the compression ratio When the product is calculated for each compression process and the sum total of these is used as the second value, the third value obtained by dividing the second value by the first value is 100 to 290. It is a range.
請求項２に記載の連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法は、請求項１に記載の発明において、前記第３の値が１０５〜２８０の範囲であることを特徴とする。
請求項３に記載の連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法は、請求項１又は請求項２に記載の発明において、前記第１の値が４．５〜２１．０の範囲であり、前記第２の値が６２０〜４８００の範囲であることを特徴とする。
The method for producing an open-cell crosslinked polyolefin resin foam according to claim 2 is characterized in that, in the invention according to claim 1, the third value is in the range of 105 to 280.
The method for producing an open-cell crosslinked polyolefin-based resin foam according to claim 3 is the invention according to claim 1 or 2, wherein the first value is in the range of 4.5 to 21.0, The second value is in a range of 620 to 4800.
本発明の連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法によれば、低圧縮歪性及びシール性に優れた連続気泡架橋ポリオレフィン系樹脂発泡体を製造することができる。 According to the method for producing an open-cell crosslinked polyolefin resin foam of the present invention, an open-cell crosslinked polyolefin resin foam excellent in low compression strain and sealing properties can be produced.
以下、本発明を具体化した実施形態を詳細に説明する。
本実施形態の製造方法は、特定の独立気泡架橋ポリオレフィン系樹脂発泡体に対して、特定の条件による圧縮処理を複数回行う圧縮工程を施すことにより、発泡体内の気泡を連通化させて連続気泡架橋ポリオレフィン系樹脂発泡体を製造するものである。以下では、本実施形態の製造方法に用いる独立気泡架橋ポリオレフィン系樹脂発泡体、及び圧縮工程について具体的に説明する。
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail.
In the manufacturing method of the present embodiment, a specific closed cell cross-linked polyolefin resin foam is subjected to a compression process in which a compression process under a specific condition is performed a plurality of times, thereby allowing the bubbles in the foam to communicate with each other to form an open cell. A crosslinked polyolefin resin foam is produced. Below, the closed-cell crosslinked polyolefin resin foam used for the manufacturing method of this embodiment and a compression process are demonstrated concretely.
［独立気泡架橋ポリオレフィン系樹脂発泡体］
本実施形態の製造方法に用いられる独立気泡架橋ポリオレフィン系樹脂発泡体（以下、独立気泡発泡体と記載する。）としては、ＪＩＳ Ｋ６７６７（１９９９附属書１の２）に規定される引張強さ（Ｎ／ｍｍ２）と、ＪＩＳ Ｋ６７６７（１９９９附属書Ａ）に規定される、長さ２５ｍｍあたりの平均セル数（個／２５ｍｍ）との積として得られる第１の値が４．５以上、好ましくは４．５〜２１．０の範囲である発泡体が用いられる。上記第１の値が４．５未満である場合、最終的に得られる連続気泡架橋ポリオレフィン系樹脂発泡体（以下、連続気泡発泡体と記載する）のシール性が著しく低下するおそれがある。
[Closed cell crosslinked polyolefin resin foam]
As the closed cell cross-linked polyolefin resin foam (hereinafter referred to as closed cell foam) used in the production method of the present embodiment, the tensile strength defined in JIS K6767 (1999 Appendix 1-2) ( N / mm 2 ) and the first value obtained as a product of JIS K6767 (1999 Annex A) and the average number of cells per 25 mm (pieces / 25 mm) is 4.5 or more, preferably Is used in the range of 4.5 to 21.0. When the first value is less than 4.5, the sealing property of the finally obtained open-cell crosslinked polyolefin resin foam (hereinafter referred to as open-cell foam) may be significantly reduced.
上記独立気泡発泡体は、平均セル数が１５〜６０個／２５ｍｍであることが好ましい。平均セル数が１５個／２５ｍｍ未満である場合、上記第１の値が４．５以上にすることが困難になり、結果として最終的に得られる連続気泡発泡体のシール性が低下しやすい。一方、平均セル数が６０個／２５ｍｍを超える場合、後の圧縮工程において気泡を連通させることが困難になる。 The closed cell foam preferably has an average cell number of 15 to 60 cells / 25 mm. When the average number of cells is less than 15 cells / 25 mm, it becomes difficult for the first value to be 4.5 or more, and as a result, the sealing property of the finally obtained open-cell foam tends to deteriorate. On the other hand, when the average number of cells exceeds 60 cells / 25 mm, it becomes difficult to communicate bubbles in the subsequent compression step.
また、上記独立気泡発泡体は、発泡倍率が１５〜５０倍であることが好ましい。発泡倍率が１５倍未満である場合、発泡体が硬くなりすぎて後の圧縮工程において気泡を連通させることが困難になる。一方、発泡倍率が５０倍を超える場合、発泡体が柔軟化されすぎて後の圧縮工程において形状を保持することが困難になる。 The closed cell foam preferably has an expansion ratio of 15 to 50 times. When the expansion ratio is less than 15 times, the foam becomes too hard and it becomes difficult to allow bubbles to communicate in the subsequent compression step. On the other hand, when the expansion ratio exceeds 50 times, the foam is too soft and it becomes difficult to maintain the shape in the subsequent compression step.
上記独立気泡発泡体は、ポリオレフィン系樹脂、発泡剤、及び架橋剤を含有する発泡体原料を反応させることにより製造することができる。具体的には、発泡体原料を混合するとともに押出機等によりシート状に形成し、同シートを加熱することによって含有される発泡剤及び架橋剤を分解させて、架橋構造を形成するとともに発泡させることによって製造することができる。 The closed cell foam can be produced by reacting a foam material containing a polyolefin resin, a foaming agent, and a crosslinking agent. Specifically, the foam raw material is mixed and formed into a sheet by an extruder or the like, and the foaming agent and the crosslinking agent contained therein are decomposed by heating the sheet to form a crosslinked structure and foam. Can be manufactured.
発泡体原料に含有されるポリオレフィン系樹脂としては、例えば、ポリオレフィン樹脂、及びポリオレフィン共重合樹脂を用いることができる。ポリオレフィン樹脂としては、低密度ポリエチレン、高密度ポリエチレン、直鎖状低密度ポリエチレン、及びポリプロピレンが挙げられる。ポリオレフィン共重合樹脂は、オレフィン及びオレフィンと共重合可能な単量体の共重合体であり、例えば、エチレン−酢酸ビニル共重合樹脂、エチレン−プロピレン共重合樹脂、エチレン−ブテン共重合樹脂、エチレン−アクリル酸エステル（メチルエステル、エチルエステル、プロピルエステル、ブチルエステル等）共重合樹脂、又はそれらの塩素化物、或いはポリプロピレン（アイソタクチックポリプロピレン又はアタクチックポリプロピレン）との混合物が挙げられる。これらの具体例のうち、一種のみが単独で含有されてもよいし、二種以上が組み合わされて含有されてもよい。 As the polyolefin resin contained in the foam material, for example, a polyolefin resin and a polyolefin copolymer resin can be used. Examples of the polyolefin resin include low density polyethylene, high density polyethylene, linear low density polyethylene, and polypropylene. The polyolefin copolymer resin is a copolymer of an olefin and a monomer copolymerizable with the olefin. For example, an ethylene-vinyl acetate copolymer resin, an ethylene-propylene copolymer resin, an ethylene-butene copolymer resin, an ethylene- Examples thereof include acrylic acid ester (methyl ester, ethyl ester, propyl ester, butyl ester, etc.) copolymer resins, or chlorinated products thereof, or a mixture with polypropylene (isotactic polypropylene or atactic polypropylene). Among these specific examples, only 1 type may be contained independently and 2 or more types may be combined and contained.
発泡剤は分解により窒素ガス等のガスを発生し、ポリオレフィン系樹脂を発泡させるものである。発泡体原料に含有される発泡剤としては、例えば、アゾジカルボンアミド（ＡＤＣＡ）、アゾビスイソブチロニトリル（ＡＩＢＮ）、ジニトロソペンタンメチレンテトラミン（ＤＰＴ）、ｐ−トルエンスルホニルヒドラジド（ＴＳＨ）を用いることができる。これらの具体例のうち、一種のみが単独で含有されてもよいし、二種以上が組み合わされて含有されてもよい。また、発泡体原料における発泡剤の含有量は、ポリオレフィン系樹脂１００質量部に対して１２〜２６質量部であることが好ましい。 The foaming agent generates a gas such as nitrogen gas by decomposition and foams the polyolefin resin. Examples of the foaming agent contained in the foam material include azodicarbonamide (ADCA), azobisisobutyronitrile (AIBN), dinitrosopentanemethylenetetramine (DPT), and p-toluenesulfonyl hydrazide (TSH). be able to. Among these specific examples, only 1 type may be contained independently and 2 or more types may be combined and contained. Moreover, it is preferable that content of the foaming agent in a foam raw material is 12-26 mass parts with respect to 100 mass parts of polyolefin resin.
架橋剤は独立気泡発泡体に架橋構造を形成して所定の硬さや強度を付与する。発泡体原料に含有される架橋剤としては、加熱により分解され、遊離ラジカルを発生してポリオレフィン系樹脂に架橋結合を生じさせる有機過酸化物が用いられる。こうした有機過酸化物としては、例えば、ジクミルパーオキサイド、２,５−ジメチル−２,５−ジ（ｔ−ブチルパーオキシ）ヘキサン、４,４−ジ（ｔ−ブチルパーオキシ）−ｎ−ブチルバレエート、α,α´−ジ（ｔ−ブチルパーオキシ−ｍ−イソプロピル）ベンゼン、１,３−ビス−ｔ−ブチルパーオキシイソプロピルベンゼンが挙げられる。これらの具体例のうち、一種のみが単独で含有されてもよいし、二種以上が組み合わされて含有されてもよい。 The cross-linking agent forms a cross-linked structure in the closed cell foam to give a predetermined hardness and strength. As the cross-linking agent contained in the foam material, an organic peroxide that is decomposed by heating to generate free radicals to cause cross-linking in the polyolefin resin is used. Examples of such organic peroxides include dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 4,4-di (t-butylperoxy) -n-. Examples include butyl valerate, α, α′-di (t-butylperoxy-m-isopropyl) benzene, and 1,3-bis-t-butylperoxyisopropylbenzene. Among these specific examples, only 1 type may be contained independently and 2 or more types may be combined and contained.
発泡体原料における架橋剤の含有量は、ポリオレフィン系樹脂１００質量部に対して０．５〜１．４質量部であることが好ましい。上記架橋剤の含有量が０．５質量部未満である場合、最終的に得られる連続気泡発泡体のシール性が低下するおそれがある。また、上記架橋剤の含有量が１．４質量部を超える場合、独立気泡発泡体の発泡時に裂けが生じる等、成形性に悪影響を与えるおそれがある。 The content of the crosslinking agent in the foam raw material is preferably 0.5 to 1.4 parts by mass with respect to 100 parts by mass of the polyolefin resin. When content of the said crosslinking agent is less than 0.5 mass part, there exists a possibility that the sealing performance of the open-cell foam finally obtained may fall. Moreover, when content of the said crosslinking agent exceeds 1.4 mass parts, there exists a possibility of having a bad influence on moldability, such as tearing at the time of foaming of a closed cell foam.
また、発泡体原料には上記各成分に加えて、例えば、発泡助剤、架橋促進剤、無機充填剤、整泡剤、難燃剤、安定剤、可塑剤、着色剤等の他の成分を適宜、配合することができる。上記他の成分のうち、発泡助剤及び架橋促進剤について説明する。 In addition to the above components, the foam raw material may contain other components such as a foaming aid, a crosslinking accelerator, an inorganic filler, a foam stabilizer, a flame retardant, a stabilizer, a plasticizer, and a colorant as appropriate. Can be blended. Among the other components, the foaming aid and the crosslinking accelerator will be described.
発泡助剤は上記発泡剤による発泡作用を調整する。発泡助剤としては、例えば、尿素等の尿素系助剤、金属酸化物、及び脂肪酸金属塩を用いることができる。金属酸化物としては、例えば、酸化亜鉛、塩化亜鉛、酢酸亜鉛、硝酸亜鉛、酸化鉛、二塩基性亜リン酸鉛、及び三塩基性硫酸鉛が挙げられる。脂肪酸金属塩としては、例えば、ステアリン酸亜鉛、ステアリン酸鉛、ステアリン酸マグネシウム、及びステアリン酸カルシウムが挙げられる。これらの具体例のうち、一種のみが単独で含有されてもよいし、二種以上が組み合わされて含有されてもよい。また、発泡体原料における発泡助剤の含有量は、ポリオレフィン系樹脂１００質量部に対して０．０１〜０．０８質量部であることが好ましい。 The foaming assistant adjusts the foaming action of the foaming agent. As the foaming aid, for example, urea aids such as urea, metal oxides, and fatty acid metal salts can be used. Examples of the metal oxide include zinc oxide, zinc chloride, zinc acetate, zinc nitrate, lead oxide, dibasic lead phosphite, and tribasic lead sulfate. Examples of the fatty acid metal salt include zinc stearate, lead stearate, magnesium stearate, and calcium stearate. Among these specific examples, only 1 type may be contained independently and 2 or more types may be combined and contained. Moreover, it is preferable that content of the foaming adjuvant in a foam raw material is 0.01-0.08 mass part with respect to 100 mass parts of polyolefin resin.
架橋促進剤は上記架橋剤による架橋作用を促進する。架橋促進剤としては、例えば、トリアリルトリメリテート、トリアリルメリテート、ジアリルメリテート、ジアリルフタレート、ジビニルベンゼン、トリメチロールプロパントリメタクリレート、１，９−ノナンジオールジメタクリレート、１，１０−デカンジオールジメタクリレート、トリメリット酸トリアリルエステル、トリアリルイソシアヌレート、エチルビニルベンゼン、ネオペンチルグリコールジメタクリレート、１，２，４−ベンゼントリカルボン酸トリアリルエステル、及び１，６−ヘキサンジオールジメタクリレートを用いることができる。これらの具体例のうち、一種のみが単独で含有されてもよいし、二種以上が組み合わされて含有されてもよい。また、発泡体原料における架橋促進剤の含有量は、ポリオレフィン系樹脂１００質量部に対して０．１〜１．０質量部であることが好ましい。上記架橋促進剤の含有量が１．０質量部を超える場合、独立気泡発泡体の発泡時に裂けが生じる等、成形性に悪影響を与えるおそれがある。 The crosslinking accelerator promotes the crosslinking action by the crosslinking agent. Examples of the crosslinking accelerator include triallyl trimellitate, triallyl melitte, diallyl melitlate, diallyl phthalate, divinylbenzene, trimethylolpropane trimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol. Use dimethacrylate, trimellitic acid triallyl ester, triallyl isocyanurate, ethyl vinyl benzene, neopentyl glycol dimethacrylate, 1,2,4-benzenetricarboxylic acid triallyl ester, and 1,6-hexanediol dimethacrylate Can do. Among these specific examples, only 1 type may be contained independently and 2 or more types may be combined and contained. Moreover, it is preferable that content of the crosslinking accelerator in a foam raw material is 0.1-1.0 mass part with respect to 100 mass parts of polyolefin resin. When the content of the crosslinking accelerator exceeds 1.0 part by mass, the moldability may be adversely affected, such as tearing during foaming of the closed cell foam.
［圧縮工程］
圧縮工程は、異方向へ回転する２本のロールの間に上記独立気泡発泡体を通過させる圧縮処理を複数回、繰り返して行うことにより、気泡膜を破裂させて独立気泡発泡体の気泡を連通化させる工程である。ここで、各圧縮処理時における圧縮条件（圧縮率、ロールの周速比）及び処理回数を、次の要件を満たすように設定する。まず、予定するロールの周速比と圧縮率との積を圧縮処理毎に算出し、それを総和した値を第２の値とする。そして、この第２の値を（圧縮工程に供する独立気泡発泡体の）第１の値で除した値を第３の値としたとき、この第３の値が１００〜２９０の範囲、好ましくは１０５〜２８０の範囲となるように設定する。なお、圧縮工程においては複数回の圧縮処理を繰り返し行うが、各圧縮処理の圧縮条件は全て同じであってもよいし、圧縮処理毎に変更してもよい。
[Compression process]
In the compression step, by repeatedly performing the compression process of passing the closed cell foam between two rolls rotating in different directions a plurality of times, the cell membrane is ruptured and the bubbles of the closed cell foam are connected. It is a process of making it general. Here, the compression conditions (compression rate, roll peripheral speed ratio) and the number of processes in each compression process are set so as to satisfy the following requirements. First, the product of the planned peripheral speed ratio of the roll and the compression ratio is calculated for each compression process, and the sum total of these is defined as the second value. And when the value which remove | divided this 2nd value by the 1st value (of the closed-cell foam used for a compression process) is made into the 3rd value, this 3rd value is the range of 100-290, Preferably It sets so that it may become the range of 105-280. In the compression process, the compression process is repeated a plurality of times, but the compression conditions for each compression process may all be the same or may be changed for each compression process.
ここで、上記圧縮率は、圧縮工程における独立気泡発泡体の圧縮度合を表す数値であって、下記一般式（１）により算出することができる。
「圧縮率（％）」＝（「独立気泡発泡体の厚み」−「ロール間距離」）／「独立気泡発泡体の厚み」×１００・・・（１）
また、上記周速比は、圧縮工程における２本のロールの回転速度の比を表す数値であって、下記一般式（２）により算出することができる。
Here, the said compression rate is a numerical value showing the compression degree of the closed cell foam in a compression process, Comprising: It can calculate by following General formula (1).
“Compression rate (%)” = (“Thickness of closed cell foam” − “Distance between rolls”) / “Thickness of closed cell foam” × 100 (1)
Moreover, the said peripheral speed ratio is a numerical value showing ratio of the rotational speed of two rolls in a compression process, Comprising: It can calculate by following General formula (2).
「周速比」＝「回転の速いロールの回転速度」／「回転の遅いロールの回転速度」・・・（２）
上記第３の値が１００未満である場合、高いシール性が得られなくなる、又は気泡を十分に連通させることができなくなるおそれがある。一方、上記第３の値が２９０を超える場合、低圧縮歪性に優れた連続気泡発泡体を得ることができなくなる。なお、上記圧縮率は独立気泡発泡体の気泡の連通効率を高めるという観点から、９０％以上であることが好ましい。また、２本のロールの回転速度が同じ、つまり周速比が「１」であってもよいが、独立気泡発泡体の気泡の連通効率を高めるという観点から、２本のロールの回転速度を異ならせる、つまり周速比が「１」を超える値となるようにロールの回転速度を設定することが好ましい。
“Peripheral speed ratio” = “Rotation speed of a fast rotating roll” / “Rotation speed of a slow rotating roll” (2)
When the third value is less than 100, high sealing performance may not be obtained, or bubbles may not be sufficiently communicated. On the other hand, when the third value exceeds 290, it becomes impossible to obtain an open-cell foam excellent in low compression strain. In addition, it is preferable that the said compression rate is 90% or more from a viewpoint of improving the communication efficiency of the bubble of a closed-cell foam. Further, the rotational speeds of the two rolls may be the same, that is, the peripheral speed ratio may be “1”. However, from the viewpoint of improving the bubble communication efficiency of the closed cell foam, the rotational speeds of the two rolls are It is preferable to set the rotation speed of the rolls so as to be different, that is, the peripheral speed ratio exceeds “1”.
一例として、第１の値が「７．５」である独立気泡発泡体に対して、条件１（圧縮率９５％、周速比１．３５）の圧縮処理を６回、条件２（圧縮率９５％、周速比１．３）の圧縮処理を３回行った場合における第２の値及び第３の値の算出例を以下に記載する。なお、同例は後述する実施例の試験例２に関するものである。 As an example, for the closed-cell foam whose first value is “7.5”, the compression treatment under condition 1 (compression rate 95%, peripheral speed ratio 1.35) is performed six times, and condition 2 (compression rate) A calculation example of the second value and the third value when the compression process of 95% and the peripheral speed ratio 1.3) is performed three times will be described below. This example relates to Test Example 2 of an example described later.
「第２の値」＝（９５×１．３５）×６＋（９５×１．３）×３＝１１４０
「第３の値」＝１１４０÷７．５＝１５２
次に本実施形態における作用効果について、以下に記載する。
“Second value” = (95 × 1.35) × 6 + (95 × 1.3) × 3 = 1140
“Third value” = 1140 ÷ 7.5 = 152
Next, operational effects in the present embodiment will be described below.
（１）本実施形態の連続気泡発泡体の製造方法では、独立気泡発泡体に対し、異方向へ回転する２本のロール間隙を通過させて圧縮する圧縮処理を複数回繰り返し行う圧縮工程を有する。そして、独立気泡発泡体として、ポリオレフィン系樹脂、発泡剤、及び架橋剤を含有する発泡体原料を反応させてなり、引張強さと平均セル数との積として得られる第１の値が４．５以上である独立気泡発泡体を用いる。また、圧縮工程では、ロールの周速比と圧縮率との積を圧縮処理毎に算出し、それを総和した値を第２の値としたとき、第２の値を第１の値で除した値として得られる第３の値が１００〜２９０の範囲となるように周速比、圧縮率及び処理回数を設定する。 (1) The method for producing an open-cell foam according to the present embodiment includes a compression step of repeatedly performing a compression process for compressing the closed-cell foam by passing through two gaps that rotate in different directions. . Then, as a closed cell foam, a foam raw material containing a polyolefin resin, a foaming agent, and a crosslinking agent is reacted, and the first value obtained as the product of tensile strength and average cell number is 4.5. The above closed cell foam is used. Also, in the compression process, when the product of the peripheral speed ratio of the roll and the compression ratio is calculated for each compression process, and the sum of these is the second value, the second value is divided by the first value. The peripheral speed ratio, the compression rate, and the number of processes are set so that the third value obtained as the obtained value is in the range of 100 to 290.
上記構成によれば、得られる連続気泡発泡体は、低圧縮歪性で、かつシール性に優れた発泡体となる。したがって、水シールやエアシール等のシール材、及び緩衝材等に適した連続気泡樹脂発泡体を製造することができる。 According to the above configuration, the obtained open-cell foam is a foam having low compressive strain and excellent sealing properties. Therefore, an open cell resin foam suitable for a sealing material such as a water seal or an air seal, and a buffer material can be manufactured.
また、上記構成によれば、圧縮工程前の独立気泡発泡体について、引張強さ及び平均セル数の２つの物性値さえ把握すればよく、他の物性値を把握する必要がない。そのため、圧縮工程前の独立気泡発泡体について、発泡倍率、平均気泡径及びゲル分率の３つの物性値を把握する必要のある特許文献１に記載された発明と比較して、効率よく連続気泡発泡体を製造することができる。 Moreover, according to the said structure, about the closed-cell foam before a compression process, it is only necessary to grasp | ascertain two physical-property values of tensile strength and an average cell number, and it is not necessary to grasp | ascertain another physical-property value. Therefore, for the closed cell foam before the compression step, compared to the invention described in Patent Document 1 where it is necessary to grasp the three physical property values of the expansion ratio, the average cell diameter and the gel fraction, the open cell is more efficient. A foam can be produced.
（２）好ましくは、発泡体原料における架橋剤の含有量は、ポリオレフィン系樹脂１００質量部に対して０．５〜１．４質量部である。この場合、独立気泡発泡体の成形性、及び最終的に得られる連続気泡発泡体のシール性を好適に確保することができる。 (2) Preferably, content of the crosslinking agent in a foam raw material is 0.5-1.4 mass parts with respect to 100 mass parts of polyolefin resin. In this case, the moldability of the closed cell foam and the sealing property of the finally obtained open cell foam can be suitably ensured.
次に、上記実施形態から把握できる技術的思想について記載する。
（イ）前記発泡体原料における前記架橋剤の含有量は、前記ポリオレフィン系樹脂１００質量部に対して０．５〜１．４質量部であることを特徴とする連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法。
Next, a technical idea that can be grasped from the above embodiment will be described.
(B) The open cell crosslinked polyolefin resin foam, wherein the content of the crosslinking agent in the foam raw material is 0.5 to 1.4 parts by mass with respect to 100 parts by mass of the polyolefin resin. Manufacturing method.
（ロ）前記発泡体原料は架橋促進剤を含有し、前記発泡体原料における前記架橋促進剤の含有量は、０．１〜１．０質量部であることを特徴とする連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法。 (B) The foam raw material contains a crosslinking accelerator, and the content of the crosslinking accelerator in the foam raw material is 0.1 to 1.0 part by mass. Manufacturing method of resin foam.
（ハ）圧縮永久歪が８％以下であり、エア漏れ量が１．０Ｌ／ｍｉｎ以下である連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法。
（ニ）シール材として用いられる連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法。
(C) A method for producing an open-cell crosslinked polyolefin resin foam having a compression set of 8% or less and an air leakage amount of 1.0 L / min or less.
(D) A method for producing an open-cell crosslinked polyolefin resin foam used as a sealing material.
次に、各試験例を挙げて上記実施形態を更に具体的に説明する。
まず、各試験例に使用した、独立気泡架橋ポリオレフィン系樹脂発泡体（以下、独立気泡発泡体と記載する。）に用いた発泡体原料の成分を以下に示す。
Next, the above embodiment will be described more specifically with reference to each test example.
First, the components of the foam raw material used for the closed cell crosslinked polyolefin resin foam (hereinafter referred to as closed cell foam) used in each test example are shown below.
ポリオレフィン系樹脂１：エチレン酢酸ビニル共重合体（東ソー社製、６３０）
ポリオレフィン系樹脂２：低密度ポリエチレン（旭化成社製、Ｆ２２２５．４）
発泡剤：アゾジカルボンアミド（永和化成社製、ＡＣ＃１Ｌ）
発泡助剤：尿素系助剤（永和化成社製、セルペースト１０１）
架橋剤：ジクミルパーオキサイド（化薬アクゾ社製、ＢＣ−ＦＦ）
架橋促進剤：トリメチロールプロパントリメタクリレート（日本ユピカ社製、ＴＭＰＴ）
上記各成分を下記表１〜５に示す配合割合で調整した各発泡体原料を押出機にて混練するとともにシート状に押出してシートを形成した。そして、このシートをオーブン中に運搬しながら、１２０〜２５０℃にて５〜２０分間加熱して発泡させることにより独立気泡型発泡体を得た。なお、表１〜５中の各成分の数値は質量部を表す。
Polyolefin resin 1: Ethylene vinyl acetate copolymer (manufactured by Tosoh Corporation, 630)
Polyolefin resin 2: Low density polyethylene (Asahi Kasei Corporation, F2225.4)
Foaming agent: Azodicarbonamide (manufactured by Eiwa Kasei Co., Ltd., AC # 1L)
Foaming aid: urea-based aid (manufactured by Eiwa Kasei Co., Ltd., cell paste 101)
Crosslinking agent: Dicumyl peroxide (manufactured by Kayaku Akzo, BC-FF)
Cross-linking accelerator: trimethylolpropane trimethacrylate (manufactured by Nippon Yupica, TMPT)
Each foam raw material prepared by adjusting the above components at the blending ratios shown in Tables 1 to 5 below was kneaded with an extruder and extruded into a sheet to form a sheet. And while conveying this sheet | seat in oven, the closed cell type foam was obtained by making it foam by heating for 5 to 20 minutes at 120-250 degreeC. In addition, the numerical value of each component in Tables 1-5 represents a mass part.
得られた独立気泡型発泡体について、下記に示す方法により引張強さ及び平均セル数を測定するとともに、その測定結果に基づいて引張強さと平均セル数との積として得られる第１の値を算出した。その結果を表１〜５に示す。 For the obtained closed cell foam, the tensile strength and the average number of cells are measured by the method shown below, and the first value obtained as the product of the tensile strength and the average number of cells is calculated based on the measurement result. Calculated. The results are shown in Tables 1-5.
引張強さの測定：ＪＩＳ Ｋ６７６７（１９９９附属書１の２）に準拠して引張強さの測定を行った。
平均セル数の測定：ＪＩＳ Ｋ６７６７（１９９９附属書Ａ）に準拠して平均セル数の測定を行った。
Measurement of tensile strength: Tensile strength was measured in accordance with JIS K6767 (1999 Annex 1-2).
Measurement of average cell number: The average cell number was measured in accordance with JIS K6767 (1999 Annex A).
次に、得られた独立気泡型発泡体のシートを厚さ１０ｍｍにスライスするとともに、スライスしたシートに対して、異方向へ回転する２本のロール間隙を通過させて圧縮する圧縮処理を複数回、繰り返し行った（圧縮工程）。圧縮処理の圧縮条件（圧縮率、周速比）、及び処理回数は表１〜５に示すとおりである。なお、２本のロールの径はともに２００ｍｍであり、ロールの回転速度（フォーム送り速度）は４〜６ｍ／ｍｉｎの範囲で設定した。 Next, the obtained closed-cell foam sheet is sliced to a thickness of 10 mm, and the sliced sheet is compressed a plurality of times by passing through two roll gaps rotating in different directions. , Repeated (compression process). Tables 1 to 5 show the compression conditions (compression rate, peripheral speed ratio) of the compression process and the number of processes. The diameters of the two rolls were both 200 mm, and the roll rotation speed (foam feed speed) was set in the range of 4 to 6 m / min.
また、途中、圧縮条件を変更したものについては、表中において条件１及び条件２として２段で表している。例えば、試験例２では、条件１（圧縮率９５％、周速比１．３５）における圧縮処理を６回行った後に、条件２（圧縮率９５％、周速比１．３）における圧縮処理を３回行っている。ここで、ロールの圧縮率と周速比との積を圧縮処理毎に算出し、それを総和した値として得られる第２の値を算出した。また、第２の値を第１の値で除した値として得られる第３の値を算出した。その結果を表１〜５に示す。 In the middle of the table, the compression conditions are changed and are shown in two stages as condition 1 and condition 2 in the table. For example, in Test Example 2, after performing the compression process under the condition 1 (compression rate 95%, circumferential speed ratio 1.35) six times, the compression process under the condition 2 (compression ratio 95%, circumferential speed ratio 1.3) Has been performed three times. Here, the product of the compression ratio of the roll and the peripheral speed ratio was calculated for each compression process, and a second value obtained as a total value was calculated. In addition, a third value obtained by dividing the second value by the first value was calculated. The results are shown in Tables 1-5.
次に、上記圧縮工程を経て製造された連続気泡架橋ポリオレフィン系樹脂発泡体（以下、連続気泡型発泡体と記載する。）について、下記に示す方法により、低圧縮歪性及びシール性の評価を行った。その結果を表１〜５に示す。 Next, for the open-cell crosslinked polyolefin resin foam produced through the compression step (hereinafter referred to as open-cell foam), low compression strain and sealability are evaluated by the following method. went. The results are shown in Tables 1-5.
低圧縮歪性の評価：ＪＩＳ Ｋ６７６７（１９９９附属書１の４）に準拠して圧縮永久歪の測定を行った。なお、圧縮永久歪が８％以下であるか否かをもって、低圧縮歪性の良否を判断した。 Evaluation of low compression strain: Compression set was measured according to JIS K6767 (1999, Annex 1-4). In addition, the quality of the low compression distortion was judged depending on whether the compression set was 8% or less.
シール性の評価：得られた連続気泡型発泡体から外径８０ｍｍ、内径６０ｍｍ、厚さ８ｍｍの円環板状の供試体を作成した。この供試体の一方側の側面に、供試体よりも外径の大きい円板状の第１ホルダを重ねるとともに、同他方側の側面に、第１ホルダと同じ外径かつ内径が６０ｍｍの貫通孔を中央に有する円環板状の第２ホルダを重ね、第１及び第２ホルダ間に供試体を挟持させた。そして、第１及び第２ホルダにて厚みが６０％となるように供試体を圧縮させた状態で固定した。なお、第２部材及び供試体はそれぞれの貫通孔の位置が重なるように位置合わせされている。次に、第２ホルダの貫通孔に送風ファンを接続し、内部の空気圧力が３９０Ｐａとなるように、第２ホルダの貫通孔を介して送風ファンにて加圧した。そして、供試体部分を通じて外部に漏れる空気量（エア漏れ量）を流量計にて測定した。なお、１分間あたりのエア漏れ量が１．０Ｌ以下であるか否かをもって、シール性の良否を判断した。 Evaluation of sealing property: An annular plate-shaped specimen having an outer diameter of 80 mm, an inner diameter of 60 mm, and a thickness of 8 mm was prepared from the obtained open cell foam. A disc-shaped first holder having an outer diameter larger than that of the specimen is stacked on one side surface of the specimen, and a through-hole having the same outer diameter as the first holder and an inner diameter of 60 mm is disposed on the other side face. An annular plate-like second holder having a central portion is stacked, and the specimen is sandwiched between the first and second holders. And it fixed in the state which compressed the specimen so that thickness might be set to 60% with the 1st and 2nd holder. In addition, the 2nd member and the test body are aligned so that the position of each through-hole may overlap. Next, a blower fan was connected to the through hole of the second holder, and pressure was applied by the blower fan through the through hole of the second holder so that the internal air pressure was 390 Pa. Then, the amount of air leaking outside through the specimen portion (air leakage amount) was measured with a flow meter. In addition, the quality of the sealing performance was judged by whether or not the amount of air leakage per minute was 1.0 L or less.
Claims (3)
ポリオレフィン系樹脂、発泡剤、及び架橋剤を含有する発泡体原料を反応及び発泡させてなり、ＪＩＳ Ｋ６７６７に規定される引張強さと、ＪＩＳ Ｋ６７６７に規定される２５ｍｍあたりの平均セル数との積として得られる第１の値が４．５以上である独立気泡架橋ポリオレフィン系樹脂発泡体を用い、
前記圧縮処理を複数回繰り返し行う圧縮工程を有し、
該圧縮工程において、前記ロールの周速比と圧縮率との積を圧縮処理毎に算出し、それを総和した値を第２の値としたとき、前記第２の値を前記第１の値で除した値として得られる第３の値が１００〜２９０の範囲であることを特徴とする連続気泡架橋ポリオレフィン系樹脂発泡体の製造方法。 A method for producing an open cell cross-linked polyolefin resin foam by allowing a closed cell cross-linked polyolefin resin foam to pass through two rolls rotating in different directions and compressing the air bubbles to communicate with each other Because
As a product of the tensile strength specified in JIS K6767 and the average number of cells per 25 mm specified in JIS K6767. Using a closed cell crosslinked polyolefin resin foam having a first value of 4.5 or more obtained,
A compression step of repeating the compression process a plurality of times,
In the compression step, when the product of the peripheral speed ratio of the roll and the compression ratio is calculated for each compression process, and the sum of the calculated values is the second value, the second value is the first value. A method for producing an open-cell crosslinked polyolefin resin foam, wherein the third value obtained as a value divided by 100 is in the range of 100 to 290.
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