JP2005281498A - ニトリル基含有共重合体ゴム組成物及びゴム加硫物 - Google Patents
ニトリル基含有共重合体ゴム組成物及びゴム加硫物 Download PDFInfo
- Publication number
- JP2005281498A JP2005281498A JP2004097657A JP2004097657A JP2005281498A JP 2005281498 A JP2005281498 A JP 2005281498A JP 2004097657 A JP2004097657 A JP 2004097657A JP 2004097657 A JP2004097657 A JP 2004097657A JP 2005281498 A JP2005281498 A JP 2005281498A
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- JP
- Japan
- Prior art keywords
- nitrile group
- containing copolymer
- rubber
- copolymer rubber
- nitrile
- 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.)
- Granted
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 79
- 239000005060 rubber Substances 0.000 title claims abstract description 79
- 229920001577 copolymer Polymers 0.000 title claims abstract description 61
- 125000002560 nitrile group Chemical group 0.000 title claims abstract description 56
- 239000000203 mixture Substances 0.000 title claims description 33
- 239000004636 vulcanized rubber Substances 0.000 title 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011630 iodine Substances 0.000 claims abstract description 13
- 229910052740 iodine Inorganic materials 0.000 claims abstract description 13
- 150000002825 nitriles Chemical class 0.000 claims abstract description 12
- 239000011203 carbon fibre reinforced carbon Substances 0.000 claims abstract description 11
- CREMABGTGYGIQB-UHFFFAOYSA-N carbon carbon Chemical compound C.C CREMABGTGYGIQB-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 abstract description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 42
- 238000005984 hydrogenation reaction Methods 0.000 description 29
- 229920000459 Nitrile rubber Polymers 0.000 description 25
- 238000000034 method Methods 0.000 description 24
- 239000000178 monomer Substances 0.000 description 24
- 229910052763 palladium Inorganic materials 0.000 description 21
- 238000004073 vulcanization Methods 0.000 description 20
- -1 and among these Chemical compound 0.000 description 13
- 239000003054 catalyst Substances 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 10
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 239000001257 hydrogen Substances 0.000 description 10
- 229920000126 latex Polymers 0.000 description 9
- 239000004816 latex Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
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- 230000000052 comparative effect Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
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- 150000001993 dienes Chemical class 0.000 description 7
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 6
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
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- 238000001125 extrusion Methods 0.000 description 5
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- 230000035882 stress Effects 0.000 description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
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- 239000002253 acid Substances 0.000 description 4
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- DWKJRODSUYNCRZ-UHFFFAOYSA-N 2,3-dichlorobicyclo[2.2.1]hepta-1,3-diene Chemical compound C1CC2=C(Cl)C(Cl)=C1C2 DWKJRODSUYNCRZ-UHFFFAOYSA-N 0.000 description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
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- 239000012190 activator Substances 0.000 description 3
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- 125000004432 carbon atom Chemical group C* 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 150000001735 carboxylic acids Chemical class 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000009778 extrusion testing Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 150000001451 organic peroxides Chemical class 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 3
- 229960002447 thiram Drugs 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
- YLXAHVVGOSHZPA-UHFFFAOYSA-N 1,2-dichlorocycloocta-1,3-diene Chemical compound ClC1=C(Cl)C=CCCCC1 YLXAHVVGOSHZPA-UHFFFAOYSA-N 0.000 description 2
- YXIWHUQXZSMYRE-UHFFFAOYSA-N 1,3-benzothiazole-2-thiol Chemical compound C1=CC=C2SC(S)=NC2=C1 YXIWHUQXZSMYRE-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
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- 239000005977 Ethylene Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
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- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
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- POULHZVOKOAJMA-UHFFFAOYSA-N dodecanoic acid Chemical compound CCCCCCCCCCCC(O)=O POULHZVOKOAJMA-UHFFFAOYSA-N 0.000 description 2
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Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
【解決手段】 不飽和ニトリル−共役ジエン共重合体の炭素−炭素不飽和結合を水素化してなるニトリル基含有共重合体ゴムであって、ヨウ素価が80以下で、ムーニー粘度(ML1+4 、100℃)が30〜100であり、ゲル含有量が1〜20重量%であるニトリル基含有共重合体ゴム。
【選択図】 なし
Description
しかしながら、ロール加工性や押出加工性を向上させるために低ムーニー粘度に調製されたニトリル基含有共重合体ゴムは、必ずしも加硫物の機械的強度が十分ではない。そこで、加硫剤を多量に添加したり補強充填剤を増量したりして加硫物の機械的強度を向上させようとすると加工性や生産性が低下し、加硫物も伸びが低下して硬度が高くなるという不都合が生じる。そのため、ムーニー粘度が低くて加工性が良く、しかも、機械的強度の大きい加硫物が得られるニトリル基含有共重合体ゴム組成物が求められている。
かくして本発明によれば、不飽和ニトリル−共役ジエン共重合体の炭素−炭素不飽和結合を水素化してなるニトリル基含有共重合体ゴム及び加硫剤を含有してなるニトリル基含有共重合体ゴム組成物であって、前記ニトリル基含有共重合体ゴムが、ヨウ素価が80以下で、ムーニー粘度(ML1+4 、100℃)が30〜100であり、かつ、ゲルを1〜20重量%含有するものであるニトリル基含有共重合体ゴム組成物、及び、該ゴム組成物を加硫してなる加硫物が提供される。
上記共役ジエン単量体としては、α、β−エチレン性不飽和ニトリル単量体と共重合可能な共役ジエン含有化合物であれば限定されず、例えば、1,3−ブタジエン、イソプレン、2,3−ジメチル−1,3−ブタジエン、1,3−ペンタジエンなどの炭素数4〜12の共役ジエン含有化合物が好ましく挙げられ、なかでも1,3−ブタジエンが好ましい。
溶媒としては、ベースニトリルゴムを溶解する有機液体であれば限定されないが、ベンゼン、トルエン、キシレン、ヘキサン、シクロヘキサン、テトラヒドロフラン、メチルエチルケトン、酢酸エチル、シクロヘキサノン、アセトンなどが好ましく使用される。
ロジウム触媒の例としては、塩化ロジウム、臭化ロジウム、よう化ロジウムなどのハロゲン化物;硝酸ロジウム、硫酸ロジウムなどの無機酸塩;酢酸ロジウム、蟻酸ロジウム、プロピオン酸ロジウム、酪酸ロジウム、吉草酸ロジウム、ナフテン酸ロジウムなどの有機酸塩;酸化ロジウム;三水酸化ロジウム;ジクロロビス−(トリフェニルホスフィン)ロジウム、トリクロロトリス−ピリジンロジウム、テトラロジウムドデカカルボニル、ジロジウムオクタカルボニル、ヘキサロジウムヘキサデカルボニル、ジカルボニルアセチルアセトン酸ロジウム,トリス(ヘキサン−2,4−ジオン)ロジウム、トリス(ヘプタン−2,4−ジオン)ロジウムなどの錯体化合物;などが挙げられる。
これらの触媒は、通常、担体に担持させて使用される。担体としては、シリカ、シリカ−アルミナ、アルミナ、珪藻土、活性炭などが挙げられる。
酸化剤としては、酸素、空気、過酸化水素などが用いられる。酸化剤の使用量は、炭素−炭素二重結合に対するモル比が、好ましくは0.1:1〜100:1、より好ましくは0.8:1〜5:1である。
還元剤としては、ヒドラジン、ヒドラジン水和物、酢酸ヒドラジン、ヒドラジン硫酸塩およびヒドラジン塩酸塩などのヒドラジン類;または、ヒドラジンを遊離する化合物が用いられる。還元剤の使用量は、炭素−炭素二重結合に対するモル比が、好ましくは0.1:1〜100:1、より好ましくは0.8:1〜5:1である。
活性剤としては、銅、鉄、コバルト、鉛、ニッケル、鉄、スズなどの金属のイオンが用いられる。活性剤の使用量は、炭素−炭素二重結合に対するモル比が、好ましくは1:1000〜10:1、より好ましくは1:50〜1:2である。
間接水素還元法の反応は、0℃から還流温度までの範囲内で加熱することにより水素化反応が行われる。かかる加熱範囲は、通常、0〜250℃、好ましくは20〜100℃、より好ましくは40〜80℃である。
本発明に用いるニトリル基含有共重合体ゴムはムーニー粘度が比較的低いので、ロール混練、押出成形、射出成形などでの加工性に優れるものとなる。
硫黄系加硫剤としては、粉末硫黄、沈降硫黄などの硫黄;4,4’−ジチオモルホリンやテトラメチルチウラムジスルフィド、テトラエチルチウラムジスルフィド、高分子多硫化物など有機硫黄化合物;などが挙げられる。
試験、評価は下記によった。
水素化前のベースニトリルゴムを重水素クロロホルムに溶解し、NMR分析により共重合組成を算出した。
(2)ヨウ素価
ヨウ素価は、JIS K 6235に準じて測定した。
(3)ムーニー粘度
ムーニー粘度(ML1+4、100℃)は、JIS K 6300に準じて測定した。
ゴム成分のゲル含有量は、ゴム試料200mgを精秤し、100mlのテトラヒドロフランに浸漬して25℃で24時間静置後、80メッシュのステンレス製金網でろ過し、金網上に残った膨潤状態の不溶解分につき溶剤を揮散させて乾燥後の重量を精秤し、乾燥不溶解分の浸漬前のゴム試料に対する割合(重量%)として求めた。
ゴム組成物を縦15cm、横15cm、厚さ0.2cmの金型に入れ、加圧しながら、160℃で30分間プレス成形し、シート状加硫物を得た。得られたシート状加硫物を3号形ダンベルで打ち抜いて試験片を作製した。これらの試験片を用いて、JIS K 6251に従い、加硫物の引張強さ、伸び、50%引張応力、100%引張応力を測定した。
上記(5)と同様にして得たシート状加硫物につき、JIS K 6253に従い、デュロメータ硬さ試験機タイプAを用いて加硫物の硬さを測定した。
ゴム組成物を内径29mm、厚さ12.5mmの金型に入れ、160℃で30分間、プレス圧10MPaで加硫し、試験片を得た。圧縮永久歪みは、この試験片を用いてJIS K 6262に従い、25%圧縮状態で135℃にて72時間保持した後に測定した。
ゴム組成物の押出試験を、ASTM D 2230−77に準じて行った。採点法はASTM−A法に従い、4段階で評価した。数字が大きいほど、成形品の表面肌の平滑性に優れる。また、この押出した試料からスウェルを算出した。
乳化重合によって得られたベースニトリルゴム(アクリロニトリル単量体単位45%、ムーニー粘度70、ゲル含有量0%)のラテックスを用い、水層間接水素還元法により水素化し、塩化ナトリウムを添加して凝固した後、クラムをろ別し、洗浄、乾燥してニトリル基含有共重合体ゴム1を得た。ニトリル基含有共重合体ゴム1のアクリロニトリル単量体単位は45%、ヨウ素価は28、ムーニー粘度は108、ゲル含有量は65%であった。
ニトリル基含有共重合体ゴム製造例1で用いたものと同じベースニトリルゴムのラテックスを塩化ナトリウムにより凝固した後、クラムをろ別し、水洗浄、乾燥して得た固形ゴムをメチルイソブチルケトンに溶解して油層水素化法により水素化し、多量のメタノール中に注いで析出させ、ろ別、メタノール洗浄、乾燥して固形ゴムとして取り出しニトリル基含有共重合体ゴム2を得た。ニトリル基含有共重合体ゴム2のアクリロニトリル単量体単位は45%、ヨウ素価は24、ムーニー粘度は78、ゲル含有量は0%であった。
25部のニトリル基含有共重合体ゴム1と、75部のニトリル基含有共重合体ゴム2とをオープンロールで50℃にて5分間混練してゴム混合物を得た。該ゴム混合物100部、老化防止剤としてアミン系老化防止剤(ナウガード445、ユニロイヤル社製)1部及び2−メルカプトベンズイミダゾール亜鉛(ノクラックMBZ,大内新興化学工業社製)1部、補強剤のカーボンブラック(FEFカーボン、東海カーボン社製)50部、加硫促進剤の酸化亜鉛5部及びステアリン酸1部、並びに、可塑剤のトリメリット酸エステル(アデカサイザーC8、旭電化社製)5部をバンバリーミキサで50℃で混合した後、オープンロールで加硫促進剤のテトラメチルチウラムジスルフィド(ノクセラーTT、大内新興社製)1.5部、2−メルカプトベンゾチアゾール(ノクセラーM、大内新興社製)0.5部を加えて50℃にて10分混練してゴム組成物を得た。二つのニトリル基含有共重合体ゴムの混合物のヨウ素価、ムーニー粘度、ゲル含有量;ゴム組成物のムーニー粘度;並びに;加硫物の引張試験、硬さ、圧縮永久歪み及び押出試験につき試験、評価した結果を表1に記す。
実施例1において、配合で表1に示す成分については表に示す部数を用いた他は実施例1と同配合で同様に行ってゴム組成物を得た。実施例1と同様の項目につき試験、評価した結果を表1に記す。
一方、ゴムとしてニトリル基含有共重合体ゴム1のみを用いてゲル含有量が極めて多く、ムーニー粘度が高すぎるゴム組成物によると、加硫物は引張強さ及び伸びが低下して硬さは増加し、圧縮永久歪みが大きくなった。また、押出成形ではスウェルが大きく、加工性が低下した(比較例1)。ムーニー粘度が規定内でもゲルを本発明の規定より多く含有するゴムを用いた場合も、比較例1と同様の試験結果であった(比較例2)。ゲルを含有しないニトリル基含有共重合体ゴム2のみを用いたゴム組成物によると、引張強さ、伸び、50%引張応力ともに良好で圧縮永久歪みも小さかったが、硬さが柔らかくなり、押出成形品の肌が粗くなった(比較例3)。同じくゲルを含有しないニトリル基含有共重合体ゴム2のみを用い、硬さを中庸にするためにカーボンブラックを増量したゴム組成物によると、ムーニー粘度が高いため、スウェルが小さいが、加硫物は肌が粗くなり、加工性に劣る結果となった(比較例4)。
Claims (2)
- 不飽和ニトリル−共役ジエン共重合体の炭素−炭素不飽和結合を水素化してなるニトリル基含有共重合体ゴム及び加硫剤を含有してなるニトリル基含有共重合体ゴム組成物であって、
前記ニトリル基含有共重合体ゴムが、ヨウ素価が80以下で、ムーニー粘度(ML1+4 、100℃)が30〜100であり、かつ、ゲルを1〜20重量%含有するものであるニトリル基含有共重合体ゴム組成物。 - 請求項1に記載のゴム組成物を加硫してなるゴム加硫物。
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