JPH0455619B2 - - Google Patents
Info
- Publication number
- JPH0455619B2 JPH0455619B2 JP60253030A JP25303085A JPH0455619B2 JP H0455619 B2 JPH0455619 B2 JP H0455619B2 JP 60253030 A JP60253030 A JP 60253030A JP 25303085 A JP25303085 A JP 25303085A JP H0455619 B2 JPH0455619 B2 JP H0455619B2
- Authority
- JP
- Japan
- Prior art keywords
- foam
- parts
- composition
- weight
- vinyl acetate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000006260 foam Substances 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000005187 foaming Methods 0.000 claims description 11
- 229920001684 low density polyethylene Polymers 0.000 claims description 11
- 239000004702 low-density polyethylene Substances 0.000 claims description 11
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 9
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 9
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 7
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 239000003431 cross linking reagent Substances 0.000 claims description 2
- 239000004088 foaming agent Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000004132 cross linking Methods 0.000 description 9
- -1 polyethylene Polymers 0.000 description 7
- 239000004698 Polyethylene Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229920000573 polyethylene Polymers 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- 239000004604 Blowing Agent Substances 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 235000019241 carbon black Nutrition 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 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 1
- 239000004156 Azodicarbonamide Substances 0.000 description 1
- 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 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000282320 Panthera leo Species 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- AZFNGPAYDKGCRB-XCPIVNJJSA-M [(1s,2s)-2-amino-1,2-diphenylethyl]-(4-methylphenyl)sulfonylazanide;chlororuthenium(1+);1-methyl-4-propan-2-ylbenzene Chemical compound [Ru+]Cl.CC(C)C1=CC=C(C)C=C1.C1=CC(C)=CC=C1S(=O)(=O)[N-][C@@H](C=1C=CC=CC=1)[C@@H](N)C1=CC=CC=C1 AZFNGPAYDKGCRB-XCPIVNJJSA-M 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 description 1
- 235000019399 azodicarbonamide Nutrition 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000010943 off-gassing Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 235000010289 potassium nitrite Nutrition 0.000 description 1
- 239000004304 potassium nitrite Substances 0.000 description 1
- 229910001261 rose's metal Inorganic materials 0.000 description 1
- 238000010058 rubber compounding Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000015424 sodium Nutrition 0.000 description 1
- 239000004317 sodium nitrate Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000007666 vacuum forming Methods 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、導電性架橋ポリエチレン発泡体に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrically conductive crosslinked polyethylene foam.
従来、ポリエチレン系導電性発泡体としては、
低密度ポリエチレンとC4〜C20のα−オレフイン
を共重合した結晶性又は連鎖状低密度ポリエチレ
ンと導電性カーボンを含有してなるもの(特開昭
59−182822号)、あるいは低密度ポリエチレンと
エチレン−1−ブテン共重合体と導電性カーボン
を含有してなるもの(特開昭58−179241号)があ
る。
Conventionally, as polyethylene conductive foam,
Products containing crystalline or chain-like low density polyethylene, which is a copolymerization of low density polyethylene and C 4 to C 20 α-olefin, and conductive carbon (Japanese Patent Application Laid-open No.
59-182822), or one containing low-density polyethylene, an ethylene-1-butene copolymer, and conductive carbon (Japanese Patent Laid-Open No. 179241/1982).
しかし、上記従来のポリエチレン系導電性発泡
体は、真空成形を目的としたものであり、ある程
度の剛性をもつようにしてあり、ウレタンフオー
ムの様な柔軟性に欠けていた。 However, the above-mentioned conventional polyethylene conductive foam is intended for vacuum forming, and is designed to have a certain degree of rigidity, but lacks the flexibility of urethane foam.
したがつて、本発明の目的は前記した従来のポ
リエチレン系導電性発泡体では達成できなかつた
柔軟性を有する導電性架橋ポリエチレン発泡体を
提供することにある。
Therefore, an object of the present invention is to provide an electrically conductive crosslinked polyethylene foam having flexibility that cannot be achieved with the conventional polyethylene electrically conductive foams described above.
本発明に係る導電性ポリエチレン発泡体は、密
度0.910〜0.935g/cm3、メルトフローレート0.5〜
5.0g/10minの低密度ポリエチレン10〜40重量部
(以下、単に「部」と表示する)と、密度0.920〜
0.945g/cm3、メルトフローレート0.5〜4.0g/
10min、酢酸ビニル含有量10〜20重量%のエチレ
ン−酢酸ビニル共重合体90〜60部と、導電性カー
ボン7〜15部を含有する組成物の架橋発泡体を機
械的に押圧してなるものであり、上記特定範囲の
組成物の導電性架橋ポリエチレン発泡体であるた
めに、柔軟性が極めて優れている。
The conductive polyethylene foam according to the present invention has a density of 0.910 to 0.935 g/cm 3 and a melt flow rate of 0.5 to
10 to 40 parts by weight of 5.0g/10min low-density polyethylene (hereinafter simply referred to as "parts") and a density of 0.920 to
0.945g/ cm3 , melt flow rate 0.5~4.0g/
10 minutes, mechanically pressing a crosslinked foam of a composition containing 90 to 60 parts of ethylene-vinyl acetate copolymer with a vinyl acetate content of 10 to 20% by weight and 7 to 15 parts of conductive carbon. Since it is a conductive crosslinked polyethylene foam with a composition within the above specified range, it has extremely excellent flexibility.
本発明の低密度ポリエチレンとは、密度0.910
〜0.935g/cm3、好ましくは0.915〜0.930g/cm3、メ
ルトフローレート0.5〜5.0g/10min、好ましくは
2.5〜4.0g/10minの低密度ポリエチレンである。
The low density polyethylene of the present invention has a density of 0.910
~0.935g/ cm3 , preferably 0.915~0.930g/ cm3 , melt flow rate 0.5~5.0g/10min, preferably
It is low density polyethylene of 2.5-4.0g/10min.
本発明において使用されるエチレン−酢酸ビニ
ル共重合体とは、密度0.920〜0.945g/cm3、好ま
しくは0.925〜0.940g/cm3、メルトフローレート
0.5〜4.0g/10min、好ましくは1.0〜3.5g/
10min、酢酸ビニル含有量10〜20重量%、好まし
くは14〜16重量%のエチレン−酢酸ビニル共重合
体である。 The ethylene-vinyl acetate copolymer used in the present invention has a density of 0.920 to 0.945 g/cm 3 , preferably 0.925 to 0.940 g/cm 3 , and a melt flow rate of
0.5~4.0g/10min, preferably 1.0~3.5g/
10 min, an ethylene-vinyl acetate copolymer with a vinyl acetate content of 10 to 20% by weight, preferably 14 to 16% by weight.
上記2種類の樹脂の組成割合は、低密度ポリエ
チレン10〜40部、特に好ましくは15〜35部、エチ
レン−酢酸ビニル共重合体90〜60部、特に好まし
くは85〜65部である。 The composition ratio of the above two types of resins is 10 to 40 parts of low density polyethylene, particularly preferably 15 to 35 parts, and 90 to 60 parts of ethylene-vinyl acetate copolymer, particularly preferably 85 to 65 parts.
低密度ポリエチレンの組成割合が40部を超える
と、樹脂の剛性が増加し、柔軟性のある発泡体が
得られない。又上記樹脂の組成割合が10部未満で
あると、発泡時の成形性が悪くなる。 When the composition ratio of low density polyethylene exceeds 40 parts, the rigidity of the resin increases and a flexible foam cannot be obtained. If the composition ratio of the resin is less than 10 parts, moldability during foaming will be poor.
本発明で使用する導電性カーボンブラツクとし
ては、フアーネス系カーボンブラツク、アセチレ
ン系カーボンブラツク、チヤンネル系カーボンブ
ラツク等があり、これらは単独で用いても2種以
上を併用してもよい。特にカーボンブラツクの中
でも表面積(窒素吸着方法)900m2/g以上のフ
アーネスブラツクが好ましい導電性カーボンブラ
ツクである。 The conductive carbon black used in the present invention includes furnace carbon black, acetylene carbon black, channel carbon black, etc., and these may be used alone or in combination of two or more. Among carbon blacks, furnace blacks having a surface area (nitrogen adsorption method) of 900 m 2 /g or more are particularly preferred conductive carbon blacks.
導電性カーボンブラツクは、前記した樹脂成分
100部当たり7〜15部加える。 Conductive carbon black is made of the resin component described above.
Add 7-15 parts per 100 parts.
前記の密度およびメルトフローレートは
JISK6760で規定された方法で測定される。 The above density and melt flow rate are
Measured using the method specified in JISK6760.
本発明においては、使用する組成物の物性の改
良或いは価格の低下を目的として、架橋結合に著
しい悪影響を与えない配合剤(充填剤)、例えば
酸化亜鉛、酸化チタン、酸化カルシウム、酸化マ
グネシウム、酸化ケイ素等の金属酸化物、炭酸マ
グネシウム、炭酸カルシウム等の炭酸塩、あるい
はパルプ等の繊維物質、又は各種染料、顔料並び
に螢光物質、その他常用のゴム配合剤等を必要に
応じて添加することができる。 In the present invention, for the purpose of improving the physical properties of the composition used or reducing the cost, we use compounding agents (fillers) that do not have a significant adverse effect on crosslinking, such as zinc oxide, titanium oxide, calcium oxide, magnesium oxide, Metal oxides such as silicon, carbonates such as magnesium carbonate and calcium carbonate, fiber materials such as pulp, various dyes, pigments, fluorescent substances, and other commonly used rubber compounding agents may be added as necessary. can.
次に、本発明の導電性架橋ポリエチレン発泡体
の製造方法について説明する。 Next, a method for manufacturing the conductive crosslinked polyethylene foam of the present invention will be explained.
前記した低密度ポリエチレンと、エチレン−酢
酸ビニル共重合体と、導電性カーボンブラツクと
からなる混合物に、周知の発泡剤、発泡助剤及び
架橋剤を添加混練し、得られた発泡性架橋性組成
物を、塩圧して密閉系金型に充填し、加圧下に加
熱温度120〜160℃、加熱時間20〜70分の条件で加
熱整形する。これによつてゲル分率0〜15%、発
泡倍率1〜3倍の発泡性架橋組成物が得られる。 A foamable crosslinkable composition obtained by adding and kneading a well-known blowing agent, a blowing aid, and a crosslinking agent to the above-described mixture of low density polyethylene, ethylene-vinyl acetate copolymer, and conductive carbon black. The product is filled into a closed mold under pressure, and heated and shaped under pressure at a heating temperature of 120 to 160°C and a heating time of 20 to 70 minutes. As a result, a foamable crosslinked composition having a gel fraction of 0 to 15% and an expansion ratio of 1 to 3 times can be obtained.
次いで、このようにして整形した発泡性架橋組
成物を、常圧下にて密閉系でない直方体型などの
所望の形状の型内に入れ、ローゼ合金、ウツド合
金等を用いるメタルバス、オイルバス、硝酸ナト
リウム、硝酸カリウム、亜硝酸カリウム等の塩の
1種又は2種以上の溶融塩を用いる塩浴中、窒素
気流中で、または直方体型がその外壁に加熱用熱
媒体導管(熱媒:スチーム等)が設けられてなる
ものでその中で、あるいは伸張可能な鉄板等によ
り覆われた状態で、所定時間加熱した後、冷却し
て発泡体を得る。加熱温度は使用するポリエチレ
ンの種類に応じて145〜210℃、好ましくは160〜
190℃であり、加熱時間は10〜90分、好ましくは
15〜40分である。 Next, the foamable crosslinked composition thus shaped is placed in a mold of a desired shape such as a non-closed rectangular parallelepiped type under normal pressure, and heated in a metal bath using a rose alloy, a wood alloy, etc., an oil bath, or a nitric acid bath. In a salt bath using one or more molten salts such as sodium, potassium nitrate, and potassium nitrite, in a nitrogen stream, or in a rectangular parallelepiped with a heating medium conduit (heat medium: steam, etc.) on its outer wall. After heating for a predetermined period of time in a device provided with the foam or covered with an extensible iron plate or the like, the foam is cooled to obtain a foam. The heating temperature is 145-210℃, preferably 160-210℃ depending on the type of polyethylene used.
190℃, heating time is 10-90 minutes, preferably
15-40 minutes.
また、本発明では、上記発泡・架橋工程を二段
階に分けて行うことができ、これにより発泡架橋
条件が緩慢となる。 Furthermore, in the present invention, the foaming/crosslinking process can be carried out in two stages, thereby slowing down the foaming/crosslinking conditions.
すなわち、発泡・架橋工程を二段階に分けて行
うことの目的は、発泡性架橋組成物の均質加熱、
即ち上記組成物の厚さ方向における加熱の不均質
性をなくすことにあり、これによつて部分的な発
泡ムラの出現による表面亀裂や、巻き込み現象、
あるいはガス抜け現象が生ずることもなく、得ら
れる発泡体の発泡倍率は30倍程度まで、また厚さ
は70mm程度まで調整することが可能である。した
がつて、この二段階発泡・架橋工程は、厚さが厚
い最終気泡体を得る場合、及び高発泡倍率例えば
発泡倍率が10倍以上の気泡体を得る場合に特に有
効である。該二段階発泡・架橋工程は、具体的に
は前述の方法によつて整形された発泡性架橋性組
成物を、第1次発泡・架橋工程において145〜180
℃の範囲の温度に設定された窒素気流中、メタル
バス中等前述の加熱方法にて5〜60分、好ましく
は10〜45分加熱した後、中間体を取り出し、つい
でこれを密閉系でない所望の形状の型内に入れ、
170〜210℃の範囲の温度に設定された窒素気流
中、メタルバス中等前述の加熱方法にて5〜50
分、好ましくは15〜40分加熱した後、冷却してよ
り低密度の発泡体を得る。上記第1次発泡・架橋
工程においては、好ましくは発泡剤の5〜70%が
分解するようにする。発泡剤の分解率が高すぎる
と2段に分けた意味がなく、前述した効果が得ら
れない。 In other words, the purpose of performing the foaming/crosslinking process in two stages is to homogeneously heat the foamable crosslinking composition,
That is, the purpose is to eliminate non-uniformity in heating in the thickness direction of the composition, thereby preventing surface cracks due to the appearance of local uneven foaming, entrainment phenomena,
Alternatively, the foaming ratio of the obtained foam can be adjusted up to about 30 times and the thickness can be adjusted up to about 70 mm without causing any outgassing phenomenon. Therefore, this two-stage foaming/crosslinking process is particularly effective when obtaining a final foam with a large thickness and when obtaining a foam with a high expansion ratio, for example, an expansion ratio of 10 times or more. Specifically, in the two-stage foaming/crosslinking step, the foamable crosslinkable composition shaped by the above-mentioned method is heated to 145 to 180% in the first foaming/crosslinking step.
After heating for 5 to 60 minutes, preferably 10 to 45 minutes using the heating method described above, such as in a metal bath, in a nitrogen stream set at a temperature in the range of Put it in the shape mold,
5 to 50 minutes using the heating method described above, such as in a nitrogen stream set to a temperature in the range of 170 to 210 degrees Celsius, or in a metal bath.
After heating for 15 to 40 minutes, preferably 15 to 40 minutes, it is cooled to obtain a foam with a lower density. In the first foaming/crosslinking step, preferably 5 to 70% of the foaming agent is decomposed. If the decomposition rate of the blowing agent is too high, there is no point in dividing the process into two stages, and the above-mentioned effects cannot be obtained.
以上のようにして得られた気泡体は、ついで例
えば等速二本ロール等により圧縮変形を加えるこ
とによつて、気泡膜は部分的に破壊され、気泡は
部分的に連通化される。 The foam obtained as described above is then compressed and deformed using, for example, two constant-velocity rolls, so that the foam membrane is partially destroyed and the bubbles are partially communicated.
得られた部分的に連続気泡を有する導電性架橋
ポリエチレン発泡体は、柔軟性に優れ、IC等の
静電気破壊防止用の簡易パツケージ材料として好
適である。 The obtained conductive crosslinked polyethylene foam having partially open cells has excellent flexibility and is suitable as a simple package material for preventing electrostatic damage in ICs and the like.
以下、実施例を示して本発明について具体的に
説明する。
The present invention will be specifically described below with reference to Examples.
実施例 1
低密度ポリエチレン(商品名:ノバテツク−
L300、密度0.922、メルトフローレート3.5、三菱
化成工業株式会社製)25部と、エチレン−酢酸ビ
ニル共重合体(商品名:エバテートH2011、密度
0.93、メルトフローレート3、酢酸ビニル含有量
15重量%、住友化学工業株式会社製)75部、フア
ーネス系カーボンブラツク(商品名:ケツチエン
ブラツクEC、表面積(窒素吸着法)1000m2/g、
ライオン・アクゾ株式会社製)13部、アゾジカル
ボンアミド(商品名:ビニホールAC#50S、永
和化成工業株式会社製)14部、活性亜鉛華0.07
部、α,α′−ビス(t−ブチルパーオキシ)ジイ
ソプロピルベンゼン(商品名:パーカドツクス−
14/P40、化薬ヌーリー株式会社製)0.9部、ジク
ミルパーオキサイド(商品名:パークミルD、日
本油脂株式会社製)、軽質炭酸カルシウム10部、
エステル系滑剤(商品名:リケマールS−100、
理研ビタミン株式会社製)0.1部からなる組成物
を80℃のミキシングロールにて練和し、135℃に
加熱されたプレス内の金型(905×415×18mm)に
練和物を充填し、30分間加圧下で加熱し、発泡性
架橋組成物を整形した。Example 1 Low density polyethylene (product name: Novatech)
L300, density 0.922, melt flow rate 3.5, Mitsubishi Chemical Corporation) 25 parts and ethylene-vinyl acetate copolymer (trade name: Evatate H2011, density
0.93, melt flow rate 3, vinyl acetate content
15% by weight, manufactured by Sumitomo Chemical Co., Ltd.) 75 parts, furnace carbon black (product name: Ketsuien Black EC, surface area (nitrogen adsorption method) 1000 m 2 /g,
Lion Akzo Co., Ltd.) 13 parts, azodicarbonamide (product name: Vinihole AC#50S, Eiwa Kasei Co., Ltd.) 14 parts, activated zinc white 0.07
α,α′-bis(t-butylperoxy)diisopropylbenzene (trade name: Perkadox)
14/P40, manufactured by Kayaku Nouri Co., Ltd.) 0.9 parts, dicumyl peroxide (product name: Percmil D, manufactured by NOF Corporation), light calcium carbonate 10 parts,
Ester lubricant (product name: Riquemar S-100,
A composition consisting of 0.1 part (manufactured by Riken Vitamin Co., Ltd.) was kneaded using a mixing roll at 80°C, and the kneaded mixture was filled into a mold (905 x 415 x 18 mm) in a press heated to 135°C. The foamable crosslinked composition was shaped by heating under pressure for 30 minutes.
該発泡性架橋組成物のゲル分率は5%、発泡倍
率は1.1倍であつた。 The gel fraction of the foamable crosslinked composition was 5%, and the expansion ratio was 1.1 times.
次いで、得られた整形物を165℃の塩浴中(硝
酸ナトリウム、硝酸カリウム、亜硝酸ナトリウム
の混合溶融塩)で50分間加熱し、発泡剤が30%分
解した第一次中間発泡体を取り出し、更に密閉系
でない金型(2120×1060×50mm)に入れ、180℃
の塩浴中で65分間加熱し、残存発泡剤を完全に分
解させ、発泡体を得た。得られた発泡体を冷却
後、ロール間隔5mmに設定した等速二本ロールの
間を10回通過させ、気泡膜を部分的に破壊させ、
気泡を部分的に連通化せしめた。得られた機械的
押圧後の導電性架橋ポリエチレン発泡体は、厚ま
40mm、みかけ密度0.046g/cm3であり、表面抵抗値
を測定たところ0.5×106Ωで、ウレタンフオーム
のような柔軟性を有していた。 Next, the obtained shaped product was heated for 50 minutes in a 165°C salt bath (mixed molten salt of sodium nitrate, potassium nitrate, and sodium nitrite), and the primary intermediate foam in which 30% of the blowing agent had been decomposed was taken out. Furthermore, put it in a non-closed mold (2120 x 1060 x 50 mm) and heat it at 180℃.
The foam was heated in a salt bath for 65 minutes to completely decompose the remaining blowing agent and obtain a foam. After cooling the obtained foam, it was passed 10 times between two constant speed rolls set at a roll spacing of 5 mm to partially destroy the cell membrane.
The air bubbles were made partially open. The resulting electrically conductive cross-linked polyethylene foam after mechanical pressing is thick.
40 mm, apparent density 0.046 g/cm 3 , surface resistance value was 0.5×10 6 Ω, and had flexibility like urethane foam.
なお表面抵抗値は、株式会社横河電機製作所製
の絶縁抵抗計TYPE3213(500V/100MΩ)を使
用し、1cm×5cm長の長手方向の絶縁抵抗を測定
した数値である。 Note that the surface resistance value is a value obtained by measuring the insulation resistance in the longitudinal direction of a 1 cm x 5 cm length using an insulation resistance meter TYPE 3213 (500 V / 100 MΩ) manufactured by Yokogawa Electric Corporation.
以上のように、本発明に係る導電性架橋ポリエ
チレン発泡体は、優れた柔軟性を有している。こ
のため、本発明の導電性架橋ポリエチレン発泡体
を加工して得られるシートは、IC等の静電気破
壊防止用の簡易パツケージ材料として好適であ
る。
As described above, the conductive crosslinked polyethylene foam according to the present invention has excellent flexibility. Therefore, the sheet obtained by processing the conductive crosslinked polyethylene foam of the present invention is suitable as a simple package material for preventing electrostatic damage in ICs and the like.
Claims (1)
ト0.5〜5.0g/10minの低密度ポリエチレン10〜40
重量部と、密度0.920〜0.945g/cm3、メルトフロ
ーレート0.5〜4.0g/10min、酢酸ビニル含有量10
〜20重量%のエチレン−酢酸ビニル共重合体90〜
60重量部に、導電性カーボン7〜15重量部、発泡
剤、発泡助剤及び架橋剤を添加混練して発泡性架
橋性組成物を得、該組成物を密閉系金型に充填
し、加圧下に加熱して、ゲル分率0〜15%、発泡
倍率1〜3倍の発泡性架橋組成物を得、次いで、
該組成物を常圧下にて加熱し、発泡体を成形した
後、該発泡体を機械的に押圧することを特徴とす
る導電性架橋ポリエチレン発泡体の製造方法。1 Low density polyethylene 10-40 with density 0.910-0.935g/cm 3 and melt flow rate 0.5-5.0g/10min
Parts by weight, density 0.920-0.945g/cm 3 , melt flow rate 0.5-4.0g/10min, vinyl acetate content 10
~20% by weight ethylene-vinyl acetate copolymer 90~
To 60 parts by weight, 7 to 15 parts by weight of conductive carbon, a foaming agent, a foaming aid, and a crosslinking agent are added and kneaded to obtain a foamable crosslinkable composition, and the composition is filled into a closed mold and processed. Heating under pressure to obtain a foamable crosslinked composition with a gel fraction of 0 to 15% and an expansion ratio of 1 to 3 times, and then
A method for producing a conductive crosslinked polyethylene foam, which comprises heating the composition under normal pressure to form a foam, and then mechanically pressing the foam.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25303085A JPS62112636A (en) | 1985-11-12 | 1985-11-12 | Electrically conductive crosslinked polyethylene foam |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP25303085A JPS62112636A (en) | 1985-11-12 | 1985-11-12 | Electrically conductive crosslinked polyethylene foam |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62112636A JPS62112636A (en) | 1987-05-23 |
JPH0455619B2 true JPH0455619B2 (en) | 1992-09-03 |
Family
ID=17245499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP25303085A Granted JPS62112636A (en) | 1985-11-12 | 1985-11-12 | Electrically conductive crosslinked polyethylene foam |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62112636A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5472639A (en) * | 1993-08-13 | 1995-12-05 | The Dow Chemical Company | Electroconductive foams |
JP6006350B2 (en) * | 2009-03-04 | 2016-10-12 | 日東電工株式会社 | Conductive resin foam |
JP2015063596A (en) * | 2013-09-25 | 2015-04-09 | 三和化工株式会社 | Polyethylene-based open-celled foam and production method thereof |
CN107903482B (en) * | 2017-11-07 | 2020-03-17 | 广州市欧橡隔热材料有限公司 | Preparation method of permanently antistatic conductive EVA |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5463172A (en) * | 1977-10-31 | 1979-05-21 | Furukawa Electric Co Ltd:The | Preparation of open-cell polyolefin foam |
JPS57191027A (en) * | 1981-05-22 | 1982-11-24 | Sanwa Kako Kk | Manufacture of bridged polyolefin continuous foamed material |
JPS5840326A (en) * | 1981-08-13 | 1983-03-09 | Asahi Chem Ind Co Ltd | Foamable polyolefin resin composition |
JPS58179241A (en) * | 1982-04-14 | 1983-10-20 | Toray Ind Inc | Foam of electroconductive thermoplastic resin |
JPS59129237A (en) * | 1983-01-13 | 1984-07-25 | Toray Ind Inc | Composition for electrically conductive foam |
-
1985
- 1985-11-12 JP JP25303085A patent/JPS62112636A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5463172A (en) * | 1977-10-31 | 1979-05-21 | Furukawa Electric Co Ltd:The | Preparation of open-cell polyolefin foam |
JPS57191027A (en) * | 1981-05-22 | 1982-11-24 | Sanwa Kako Kk | Manufacture of bridged polyolefin continuous foamed material |
JPS5840326A (en) * | 1981-08-13 | 1983-03-09 | Asahi Chem Ind Co Ltd | Foamable polyolefin resin composition |
JPS58179241A (en) * | 1982-04-14 | 1983-10-20 | Toray Ind Inc | Foam of electroconductive thermoplastic resin |
JPS59129237A (en) * | 1983-01-13 | 1984-07-25 | Toray Ind Inc | Composition for electrically conductive foam |
Also Published As
Publication number | Publication date |
---|---|
JPS62112636A (en) | 1987-05-23 |
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