JP5545165B2 - 免震構造体用ゴム組成物 - Google Patents
免震構造体用ゴム組成物 Download PDFInfo
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- JP5545165B2 JP5545165B2 JP2010234198A JP2010234198A JP5545165B2 JP 5545165 B2 JP5545165 B2 JP 5545165B2 JP 2010234198 A JP2010234198 A JP 2010234198A JP 2010234198 A JP2010234198 A JP 2010234198A JP 5545165 B2 JP5545165 B2 JP 5545165B2
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- Prior art keywords
- rubber
- seismic isolation
- rubber composition
- isolation structure
- mass
- Prior art date
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- KMNUDJAXRXUZQS-UHFFFAOYSA-L zinc;n-ethyl-n-phenylcarbamodithioate Chemical compound [Zn+2].CCN(C([S-])=S)C1=CC=CC=C1.CCN(C([S-])=S)C1=CC=CC=C1 KMNUDJAXRXUZQS-UHFFFAOYSA-L 0.000 description 1
- SZNCKQHFYDCMLZ-UHFFFAOYSA-L zinc;propan-2-yloxymethanedithioate Chemical compound [Zn+2].CC(C)OC([S-])=S.CC(C)OC([S-])=S SZNCKQHFYDCMLZ-UHFFFAOYSA-L 0.000 description 1
- DUBNHZYBDBBJHD-UHFFFAOYSA-L ziram Chemical compound [Zn+2].CN(C)C([S-])=S.CN(C)C([S-])=S DUBNHZYBDBBJHD-UHFFFAOYSA-L 0.000 description 1
- IHPKGUQCSIINRJ-UHFFFAOYSA-N β-ocimene Natural products CC(C)=CCC=C(C)C=C IHPKGUQCSIINRJ-UHFFFAOYSA-N 0.000 description 1
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Description
[1]ゴム成分と樹脂成分とを含有してなる免震構造体用ゴム組成物において、ゴム成分としてジエン系ゴムを含有するとともに、樹脂成分として、軟化点が80〜145℃及び重量平均分子量が500〜1050であるテルペンフェノール共重合体をゴム成分100質量部に対して1〜20質量部配合することを特徴とする免震構造体用ゴム組成物。
[2]ジエン系ゴムとして、天然ゴム(NR)とポリイソプレンゴム(IR)とを併用する[1]記載の免震構造体用ゴム組成物。
[3]ゴム成分100質量部に対して、カーボンブラックを20〜30質量部の範囲内で配合する[1]又は[2]記載の免震構造体用ゴム組成物。
[4]更に、硬化脂肪酸を配合する[1]、[2]又は[3]記載の免震構造体用ゴム組成物。
本発明の免震構造体用ゴム組成物では、ゴム成分としてジエン系ゴムが使用される。
ジエン系ゴムとしては、公知のものを用いることができ、特に制限されるものではないが、具体的には、公知の天然ゴム(NR)や、ブタジエンゴム(BR)、スチレン−ブタジエンゴム(SBR)、イソプレンゴム(IR)、スチレン−イソプレン共重合体、ブチルゴム(IIR)、ハロゲン化ブチルゴム、クロロプレンゴム、イソブチレン−イソプレンゴム、アクリロニトリル−ブタジエンゴム、エポキシ化天然ゴム、アクリレートブタジエンゴム等の合成ゴム、及びこれら天然ゴム又は合成ゴムの分子鎖末端が変性されたもの等を用いることができ、これらの中から1種を単独で、又は2種以上を混合して用いることができる。本発明においては、特に、天然ゴム(NR)やイソプレンゴム(IR)を好適に用いることができる。
下記、表1及び表2に示すAの各配合成分を混練し、次いでBの硫黄及び促進剤CZを配合して更に混練し、実施例1〜5及び比較例1〜7のゴム組成物を調製した。得られた各ゴム組成物を2mm厚保に圧延してゴムシートを製造し、下記物性を測定、評価した。結果を表1,2に示す。また、実施例により得られたゴムの弾性率と歪依存性との関係を表したグラフを図2に示した。
JIS K 6301に準拠して、破断伸びを求めた。
(2)引張強度(Tb)
JIS K 6301に準拠して、引張強度を求めた。
(3)300%モジュラス(M 300)
JIS K 6301に準拠して求めた。
[剪断弾性率の測定サンプルの作製]
ゴムシートを25mm×25mmの方形状に打ち抜いた1枚の方形状ゴムシートを作製し、これを25mm×60mm×厚み2.3mmの2枚の鉄板で挟んだ。即ち、図1(A)に示すように、接着剤を塗布した2枚の鉄板22の間に、方形状ゴムシート20を、断面クランク状となるように挟んだ。このように、鉄板22とこれに接するゴムシート20の面とを接着した状態で加硫を行い鉄板22とゴムシート20面との接着をした。これにより図1(B)に示す形状のサンプルを得た。
[剪断弾性率の測定]
サンプルを、バネ剛性、損失エネルギー測定装置(鷺宮製作所製、型式:EFH−26−8−10)に配置した。上述の2枚の鉄板22(図1(B)参照)に対し、ゴムシート20に対して外側及び内側方向に、周波数0.2Hzで100%→250%と剪断率を変えて剪断力を付与した。同剪断率では各3回剪断力を付与した。
そして、各剪断率において、測定値(3回)を平均し、G及びHeqを算出した。なお、「G」は、剪断弾性係数(等価バネ剛性と称されることもある)を意味し、「Heq」は等価減衰定数であり、ヒステリシスロスの大きさの指標とされる。
・天然ゴム(NR):「RSS#4」
・ポリイソプレンゴム(IR):「IR2200」(JSR社製)
・カーボンブラック:旭カーボン(株)のFT級カーボンブラック、商品名「アサヒサーマル」
・テルペンフェノール共重合体:ヤスハラケミカル株式会社
「YSポリスターT100」(軟化点120℃、重量平均分子量550)
「YSポリスターT145」(軟化点145℃、重量平均分子量1050)
「YSポリスターT80」(軟化点80℃、重量平均分子量500)
・芳香族変性テルペン樹脂:ヤスハラケミカル株式会社「YSレジンTO−105」
・硬化脂肪酸:「ルナック」花王ケミカル社製
・老化防止剤:「ノクラック6C」大内新興化学社製
・オイル:ナフテンオイル
・硫黄:「セイミサルファー」日本乾溜工業社製
・加硫促進剤CZ:「ノクセラーCZ」大内新興化学社製
即ち、図2のグラフは、テルペンフェノール共重合体(T100)を使用した実施例1〜3のほか、カーボンブラックの配合量を変えた例(比較例1〜3)、芳香族変性テルペン樹脂を用いた例(比較例4,5)及びナフテンオイルの配合量を変えた例(比較例6,7)であり、実施例の方が他の例よりも、G(250%)/G(100%)の値が高く、高歪領域でのソフトニングの低減効果が大きいものであることを示している。
なお、テルペンフェノール共重合体を5phr添加した実施例1では、剪断弾性率が約10%低下しているにもかかわらず、G(250%)/G(100%)の値は比較例1と変わらない。
22 鉄板
Claims (4)
- ゴム成分と樹脂成分とを含有してなる免震構造体用ゴム組成物において、ゴム成分としてジエン系ゴムを含有するとともに、樹脂成分として、軟化点が80〜145℃及び重量平均分子量が500〜1050であるテルペンフェノール共重合体をゴム成分100質量部に対して1〜20質量部配合することを特徴とする免震構造体用ゴム組成物。
- ジエン系ゴムとして、天然ゴム(NR)とポリイソプレンゴム(IR)とを併用する請求項1記載の免震構造体用ゴム組成物。
- ゴム成分100質量部に対して、カーボンブラックを20〜30質量部の範囲内で配合する請求項1又は2記載の免震構造体用ゴム組成物。
- 更に、硬化脂肪酸を配合する請求項1、2又は3記載の免震構造体用ゴム組成物。
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