JP7227220B2 - 二成分型室温硬化性強化エポキシ接着剤 - Google Patents
二成分型室温硬化性強化エポキシ接着剤 Download PDFInfo
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Description
a)樹脂側Aが、
A-1)液体エポキシ樹脂又は非ゴム変性エポキシ樹脂の液体混合物と;
A-2)5~50%の全ゴム含有量を樹脂側Aに提供するのに十分な量での、i)コア-シェルゴム粒子、ii)キャップドイソシアネート基を有するエラストマー強化剤、及びiii)ゴム変性エポキシ樹脂の少なくとも1つと;
A-3)樹脂側Aの総重量を基準として、1~20重量パーセントの少なくとも1種の可塑剤と;
A-4)樹脂側Aの総重量を基準として、5~40重量パーセントの少なくとも1種の微粒子充填材と
を含み;
b)硬化剤側Bが、
B-1)少なくとも2個の第一級及び/又は第二級アミノ基並びに200~6000の数平均分子量を有する少なくとも1種の液体ポリエーテルアミンと;
B-2)200~3000のアミン水素当量を有する少なくとも1種のブタジエンの液体アミン末端ポリマーと;
B-3)少なくとも1種のエポキシ硬化触媒と
を含む
接着剤である。
で例示されるように、炭素環中の2個の隣接原子に結合したエポキシ酸素を有する飽和炭素環を含む。nが1である場合、脂環式エポキシドは、モノエポキシドである。nが2以上である場合、ジエポキシド又はポリエポキシドが形成される。モノエポキシド、ジエポキシド及び/又はポリエポキシドの混合物を使用することができる。参照により本明細書に援用される、米国特許第3,686,359号明細書に記載されているような脂環式エポキシ樹脂を本発明で使用し得る。特に興味のある脂環式エポキシ樹脂は、(3,4-エポキシシクロヘキシル-メチル)-3,4-エポキシ-シクロヘキサンカルボキシレート、ビス-(3,4-エポキシシクロヘキシル)アジペート、ビニルシクロヘキセンモノオキシド及びそれらの混合物である。
a)1個の第一級又は第二級アミノ基を有する脂肪族、芳香族、脂環式、芳香脂肪族及び/又はヘテロ芳香族モノアミン
b)モノフェノール、ポリフェノール及びアミノフェノールなどの、フェノール化合物。そのようなフェノールキャッピング化合物の例としては、フェノール、それぞれが1~30個の炭素原子を含有し得る1つ以上のアルキル基を含有するアルキルフェノール、ナフトール又はハロゲン化フェノールが挙げられる。好適なポリフェノールは、1分子当たり2個以上、好ましくは2個のフェノール性ヒドロキシル基を含有し、レゾルシノール、カテコール、ヒドロキノン、ビスフェノール、ビスフェノールA、ビスフェノールAP(1,1-ビス(4-ヒドロキシフェニル)-1-フェニルエタン)、ビスフェノールF、ビスフェノールK、ビスフェノールM、テトラメチルビスフェノール及びo,o’-ジアリル-ビスフェノールA、並びにそれらのハロゲン化誘導体が挙げられる。好適なアミノフェノールは、少なくとも1個の第一級若しくは第二級アミノ基と、少なくとも1個のフェノール性ヒドロキシル基とを含有する化合物である。アミノ基は、好ましくは、芳香環の炭素原子に結合している。好適なアミノフェノールの例としては、2-アミノフェノール、4-アミノフェノール、様々なアミノナフトール等が挙げられる。
c)芳香環上に1つ以上のアルキル基で置換されていてもよい、ベンジルアルコール;
d)2-ヒドロキシエチルアクリレート、2-ヒドロキシプロピルアクリレート、4-ヒドロキシブチルアクリレート、2-ヒドロキシブチルアクリレート、2-アミノプロピルアクリレート、2-ヒドロキシエチルメタクリレート、2-ヒドロキシプロピルメタクリレート、4-ヒドロキシブチルメタクリレート及び2-ヒドロキシブチルメタクリレートなどのヒドロキシ官能性アクリレート又はメタクリレート化合物;
e)ドデカンチオールなどの、アルキル基中に2~30個、好ましくは6~16個の炭素原子を有するアルキルチオールなどのチオール化合物;
f)アセトアミド及びN-アルキルアセトアミドなどの少なくとも1個のアミン水素を有するアルキルアミド化合物;並びに
g)ケトキシム
がある。
を有し得る。2-メタクリロイルオキシエチル-トリメトキシシランは、好適なアクリル変性シラン化合物である。存在する場合、アクリル変性シラン化合物は、硬化剤側Bの総重量の少なくとも0.1、少なくとも0.5、少なくとも1又は少なくとも2パーセントを構成し得、その10%以下、8%以下、6%以下又は4%以下を構成し得る。
を有し得る。ビス(2-メタクリロイルオキシエチル)ホスフェート及び2-メタクリロイルオキシエチルホスフェートは、好適なアクリル変性ホスフェート化合物である。存在する場合、アクリル変性ホスフェート化合物は、硬化剤側Bの総重量の少なくとも0.1、少なくとも0.5、少なくとも1又は少なくとも2パーセントを構成し得、その10%以下、8%以下、6%以下又は4%以下を構成し得る。
エポキシ樹脂は、約186のエポキシ当量を有するビスフェノールAのジグリシジルエーテルである。
樹脂側組成物1~8は、表1にリストアップされる成分をブレンドすることによって調製する。
実施例8~10は、実施例1~7に関して示されたものと同じ基材及び硬化条件を用いて、前実施例に記載されたものと同じ一般的な方法で製造し、試験する。硬化剤側は、前実施例に記載されたような硬化剤側B-1である。実施例8~10は、可塑剤が、次のとおり、等重量の異なる可塑剤で置き換えられることを除いて、上記の樹脂側3と同じ組成を有する、樹脂側8~10:
樹脂側8:可塑剤C
樹脂側9:可塑剤D
樹脂側10:可塑剤E
を、それぞれ、使用して製造する。
実施例11~13は、実施例1~7に関して示されたものと同じ基材及び硬化条件を用いて、前実施例に記載されたものと同じ一般的な方法で製造し、試験する。硬化剤側は、前実施例に記載されたような硬化剤側B-1である。樹脂側は、表6に示される成分を混合することによって製造する。ラップせん断強度及び%凝集破壊は、表6に示すとおりである。
実施例14~20は、表7に示されるような樹脂側組成物及び表8に示されるような硬化剤側組成物から製造する。
Claims (19)
- 樹脂側Aと硬化剤側Bとを含む二成分型エポキシ接着剤であって、
a)前記樹脂側Aが、
A-1)液体エポキシ樹脂又は非ゴム変性エポキシ樹脂の液体混合物と;
A-2)前記樹脂側Aの総重量を基準として、5~50重量パーセントのゴム含有量を樹脂側Aに提供するのに十分な量での、i)コア-シェルゴム粒子、ii)キャップドイソシアネート基を有するエラストマー強化剤及びiii)ゴム変性エポキシ樹脂の少なくとも1つと;
A-3)前記樹脂側Aの総重量を基準として、1~20重量パーセントの少なくとも1種の可塑剤と;
A-4)前記樹脂側Aの総重量を基準として、5~40重量パーセントの少なくとも1種の微粒子充填材と
を含み;
b)前記硬化剤側Bが、
B-1)少なくとも2個の第一級及び/又は第二級アミノ基並びに200~6000の数平均分子量を有する少なくとも1種の液体ポリエーテルアミンと、
B-2)200~3000のアミン水素当量を有する少なくとも1種のブタジエンの液体アミン末端ポリマーと;
B-3)少なくとも1種のエポキシ硬化触媒と
を含む
接着剤。 - 前記可塑剤が、アルキルフタレート(ここで、前記アルキル基は、それぞれ、7~21個の炭素原子を有する)、アルキルベンジルフタレート(ここで、前記アルキル基は、7~21個の炭素原子を有する)、アルキルスルホン酸のフェニルエステル(ここで、前記アルキル基は、10~21個の炭素原子を有する)及び1,2-シクロヘキサンジカルボン酸のアルキルエステル(ここで、前記アルキル基は、7~21個の炭素原子を有する)の1つ以上である、請求項1に記載の二成分型エポキシ接着剤。
- 前記樹脂側Aが6~12重量パーセントの可塑剤を含む請求項1又は2に記載の二成分型エポキシ接着剤。
- 前記硬化剤側Bが、B-4)ゲル浸透クロマトグラフィーによる少なくとも25,000の数平均分子量を有する少なくとも1種のポリエチレンイミン硬化剤を更に含む請求項1~3のいずれか一項に記載の二成分型エポキシ接着剤。
- A-2が、前記樹脂側Aの総重量を基準として、10~30重量パーセントのゴム含有量を樹脂側Aに提供するのに十分な量で存在する請求項1~4のいずれか一項に記載の二成分型エポキシ接着剤。
- A-2が、前記コア-シェルゴム粒子と、キャップドイソシアネート基を有する前記エラストマー強化剤との混合物である請求項1~5のいずれか一項に記載の二成分型エポキシ接着剤。
- 前記樹脂側Aが、3~15重量パーセントの前記コア-シェルゴム粒子と、キャップドイソシアネート基を有する5~15重量パーセントの前記エラストマー強化剤とを含有する請求項1~6のいずれか一項に記載の二成分型エポキシ接着剤。
- 前記硬化剤側BがB-5)10重量パーセント以下の潜在性硬化剤を更に含む請求項1~7のいずれか一項に記載の二成分型エポキシ接着剤。
- 前記硬化剤側Bが、硬化剤側Bの重量を基準として、1~4重量パーセントの、アクリル変性シラン化合物及びアクリル変性ホスフェート化合物の少なくとも1つを更に含む請求項1~8のいずれか一項に記載の二成分型エポキシ接着剤。
- 前記アクリル変性シラン化合物が、2-メタクリロイルオキシエチル-トリメトキシシランである請求項10に記載の二成分型エポキシ接着剤。
- 前記アクリル変性ホスフェート化合物が、ビス(2-メタクリロイルオキシエチル)ホスフェート及び2-メタクリロイルオキシエチルホスフェートから選択される請求項11に記載の二成分型エポキシ接着剤。
- 前記エポキシ硬化触媒が、少なくとも1種の第三級アミン化合物を含む請求項1~13のいずれか一項に記載の二成分型エポキシ接着剤。
- 成分A-1)が、樹脂側Aの総重量の30~70%を構成する請求項1~14のいずれか一項に記載の二成分型エポキシ接着剤。
- 請求項1~15のいずれか一項に記載の接着剤の前記樹脂側Aと前記樹脂側Bとを組み合わせて硬化性接着剤混合物を形成する工程と、2つの基材間のボンドラインで前記硬化性接着剤混合物の層を形成する工程と、次に前記ボンドラインで接着剤層を硬化させて前記ボンドラインで前記2つの基材に接合した硬化接着剤を形成する工程とを含む、2つの基材の接合方法。
- 前記基材の少なくとも1つが、油を引いた金属である請求項16に記載の方法。
- 前記硬化が、10~50℃の温度で行われる請求項16又は17に記載の方法。
- 前記硬化接着剤が、DIN EN ISO 527-1に従って測定されるときに、4~25%の伸び、少なくとも10MPaの引張強さ、及び少なくとも400MPaの弾性率を示す請求項16~18のいずれか一項に記載の方法。
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