JP6422215B2 - 液状エポキシ樹脂組成物及びこれを用いた接着剤 - Google Patents
液状エポキシ樹脂組成物及びこれを用いた接着剤 Download PDFInfo
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- Adhesives Or Adhesive Processes (AREA)
Description
すなわち、本発明は以下のとおりである。
(A)成分、(B)成分、および(C)成分をプラネタリーミキサーで均一に混合することにより、実施例及び比較例のエポキシ樹脂組成物を作製した。構成成分の配合割合を表1及び表2に示す。
(A)成分:ビスフェノールA型液状エポキシ樹脂(三菱化学社製、商品名「jER828」、エポキシ当量184〜194g/eq)
得られた組成物について、粘度、流れ性、耐沈降性を以下に示す測定方法にて評価を行った。評価結果を表1及び表2に示す。
E型粘度計(東機産業社製、商品名「TVE−35H」、コーンプレート:直径28mm、角度3°)を使用し、温度25℃にて、ロータ回転数を任意に設定し、装置を始動させ5分後に針が示した目盛値に規定の換算乗数を乗じて粘度を算出した。
薄い板状である金属を積み重ねて被着体として、それを微小隙間が出来るように2枚重ね合わせ、常温にてその隙間へ均一に流し込み、加熱硬化(硬化条件120℃、40分間)後、積み重ねた隙間から浸み出し具合を観察し、以下の判定基準により判定した。
○:浸み出しなし
△:常温時に浸み出しはないが、加熱硬化後に浸み出しがある
×:常温時に浸み出しがある
容器に密閉した状態において40℃雰囲気中に2週間保管し、充填剤が沈降して容器底部に沈積層が形成される様子を経時的に観察し、以下の判定基準により判定した。
○:沈降なし
△:沈積層が形成されているが、撹拌により組成物が均一な状態になる
×:固い沈積層が形成され、組成物が不均一な状態である
また、参考例1〜3及び比較例3の組成物は実施例1での(C1−1)に代えて、特定の平均粒子径を有する(C1)成分を用いており、参考例1〜3では平均粒子径を所定の範囲(2〜10μmの範囲)にて配合しており、耐沈降性が良好であることがわかる。それに対し、比較例3では所定の範囲より大きい平均粒子径である(C1−2)を用いたことにより、耐沈降性が低下したことがわかる。一方で、比較例4〜6の組成物も同じようにして、実施例1での(C1−1)に代えて、特定の平均粒子径を有する(C1)成分を用いており、さらに(C2−1)に代えて、(C2−2)シリカ(ニッチツ社製、商品名「ハイシリカF6A」、平均粒子径4.9μm)を用いたものである。所定の範囲(0.1〜2μmの範囲)より大きい平均粒子径である(C2)成分を用いたことにより耐沈降性が低下したことがわかる。
Claims (4)
- 磁石を固定するための接着剤に用いられる液状エポキシ樹脂組成物において、
(A)エポキシ樹脂、(B)硬化剤及び(C)無機充填剤を含有し、
前記(C)成分は、(C1)平均粒子径が2.0〜10μmである炭酸カルシウムと、(C2)平均粒子径が0.1〜2.0μmである水酸化アルミニウムとを含有し、
質量比で、(C1)成分を1としたとき、(C2)成分が0.01〜0.5の範囲で配合してあることを特徴とする液状エポキシ樹脂組成物。 - (C1)成分と(C2)成分の平均粒子径の差が、1.7μm以上である請求項1に記載の液状エポキシ樹脂組成物。
- 請求項1または2に記載の液状エポキシ樹脂組成物を含有することを特徴とする接着剤。
- 請求項1〜3のいずれかに記載の液状エポキシ樹脂組成物の硬化物を介してモータ本体に磁石が埋め込まれた構造を含むInterior Permanent Magnetロータ。
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