JP5252327B2 - 有機el素子用水分吸着剤及びその製造方法 - Google Patents
有機el素子用水分吸着剤及びその製造方法 Download PDFInfo
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- JP5252327B2 JP5252327B2 JP2011155397A JP2011155397A JP5252327B2 JP 5252327 B2 JP5252327 B2 JP 5252327B2 JP 2011155397 A JP2011155397 A JP 2011155397A JP 2011155397 A JP2011155397 A JP 2011155397A JP 5252327 B2 JP5252327 B2 JP 5252327B2
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- organic
- calcium oxide
- moisture
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- producing
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- 239000000292 calcium oxide Substances 0.000 claims abstract description 50
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 30
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 23
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- MUJRNJDKBBSXSE-UHFFFAOYSA-N calcium;butan-1-olate Chemical compound [Ca+2].CCCC[O-].CCCC[O-] MUJRNJDKBBSXSE-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Description
水分ゲッターは、封止後に水分を急速に吸着することが要求されるため、酸化バリウムや酸化ストロンチウム、もしくは水分吸着速度を速めた酸化カルシウムが使用されている。そして、水分吸着速度を速めた酸化カルシウムは、例えば特許文献1に開示されているように、水酸化カルシウムを減圧条件下にて焼成することにより得ることが出来る。
従来、これらの問題点を解決する方法としては、粒子表面を改質する方法が知られている。しかし、本用途に関しては、酸化カルシウムの表面を脂肪酸などの表面処理剤でコーティングすると、疎水性に改質することは出来るが、吸湿速度が低下し本来の活性を失ってしまうことが問題となる。
なお、粉砕処理は、一段で行っても良いが、メディア径や粉砕装置を換えて多段で粉砕を行っても良い。
予め乾燥したシャーレの重量を測定し[A(g)]とした。測定対象となる粉末約0.6gをシャーレに仕込み、重量を正確に秤量し[B(g)]とした。粉体を仕込んだシャーレを24℃、相対湿度55%に保った恒温恒湿槽に入れ120分後の重量を計測し[C(g)]として、下記式(2)によって重量増加率を算出した。
JIS K5101−13−2:2004 顔料試験方法−第13部:吸油量−第2節:煮あまに油法に従って測定を行った。所定量の粉末試料に煮あまに油を滴下し煮あまに油と練り合わせた試料がらせん形に巻くことができる状態になった終点の滴下量より吸油量(mL/100g)を求めた。
試料の分散溶媒としてエタノールを使用し、超音波ホモジナイザー(MODEL US−150T、(株)目本精機製作所製)で3分間分散処理を行った。分散させた試料をレーザー回折式粒度分布測定装置(MICROTRAC HRA9320−X100、日機装(株)製)を用いて平均粒子径の測定をした。
BET比表面積の測定は、Monosorb(Quantachrome製)を用いてBET一点法により測定した。
試料の有機溶媒への分散性評価は、n−ヘキサンを用いて行った。ガラス瓶にn−ヘキサン5mlをとり、試料を約0.1g加え、一分間振盪後、静置し30秒後の溶液の様子を観察した。ヘキサン中に分散して濁っていれば、有機溶媒と試料の分散性が良好(○)であると評価し、ヘキサン中では凝集してヘキサンが透明のまま試料が沈殿していれば有機溶媒と試料の分散性は悪い(×)と評価した。
窒素充填したグローブボックス内で容積4.4cm3の石英容器(底面10mm×10mm、高さ44mm)に試料を静かに詰め、山盛り充填した。粉の表面をすり切って試料重量を正確に秤量し[D(g)]として、下記式(3)によりかさ密度を算出した。
FT−IRの測定は、フーリエ変換赤外分光光度計(FT/IR−6100、日本分光(株)製)に1回反射測定装置(ATR PRO470−H)を組み付け測定を行った。測定した波数の範囲は4000−400cm−1である。
100mL密閉容器(ポリプロピレン製)に直径φ4.0mmのジルコニア製ビーズ((株)ニッカトー製)を120gと水酸化カルシウム微粉末の造粒品を600℃で焼成した高比表面積酸化カルシウム粒状品(BET比表面積16.5m2/g、粒度2−3mm)6gとエタノール0.45gを加え密封した。以上の操作は、窒素を充填したグローブボックス内で行い、本密閉容器が窒素で充填されるようにした。グローブボックスから取り出した本密閉容器をロッキングミル((株)セイワ技研)で4時間700rpmで粉砕処理した。処理後、窒素充填したグローブボックス内で目開き500μmの篩を用いてジルコニア製ビーズとCaO粉末を分離した。分離・回収したCaO粉末を棚式乾燥機にて窒素雰囲気中で150℃、18時間乾燥処理を行い、粒子表面をアルコキシドで覆ったCaO粉末を得た。得られたCaO粉末の表面にアルコキシド層が存在することをFT−IRにより確認した。得られたCaO粉末の物性は、表1に示す。
高比表面積酸化カルシウム粒状品の代わりに高純度酸化カルシウム粉末(超高純度カルシア(CSQ)、BET比表面積2.3m2/g、平均粒子径16.5μm、宇部マテリアルズ(株)製)を使用したことを除いては、実施例1と同じ方法によって製造した。得られたCaO粉末の表面にアルコキシド層が存在することをFT−IRにより確認した。得られたCaO粉末の物性は、表1に示す。
エタノールの代わりに2−プロパノールを使用したことを除いては、実施例2と同じ方法によって製造した。得られたCaO粉末の表面にアルコキシド層が存在することをFT−IRにより確認した。得られたCaO粉末の物性は、表1に示す。
エタノールの代わりに1−ブタノールを使用したことを除いては、実施例2と同じ方法によって製造した。得られたCaO粉末の表面にアルコキシド層が存在することをFT−IRにより確認した。得られたCaO粉末の物性は、表1に示す。
高純度酸化カルシウム粉末(超高純度カルシア(CSQ)、BET比表面積2.3m2/g、平均粒子径16.5μm、宇部マテリアルズ(株)製)を使用した。本CaO粉末の物性は、表1に示す。
シグマ・アルドリッチ製酸化カルシウム(nanopowder particle size<160nm(BET))を使用した。本CaO粉末の物性は、表1に示す。
ステアリン酸0.065gをジエチルエーテル40mLで溶解した。この溶液にシグマ・アルドリッチ製酸化カルシウム(nanopowder particle size<160nm(BET))を1.3g添加し10分間混合した。混合溶液を30℃にて12時間真空乾燥し溶媒を除去した。回収した乾燥粉を窒素充填したグローブボックス内でメノウ乳鉢を用いて解砕処理を行い脂肪酸で表面処理をしたCaO粉末を得た。得られたCaO粉末の物性は、表1に示す。
Claims (2)
- 表面にアルコキシド層を有する酸化カルシウム粒子を主成分とすることを特徴とする有機EL素子用水分吸着剤。
- 酸化カルシウムをアルコール存在下にて乾式粉砕を行った後、乾燥処理を行うことを特徴とする有機EL素子用水分吸着剤の製造方法。
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PCT/JP2012/067292 WO2013008734A1 (ja) | 2011-07-14 | 2012-07-06 | 有機el素子用水分吸着剤及びその製造方法 |
KR1020147003648A KR101925282B1 (ko) | 2011-07-14 | 2012-07-06 | 유기 전기발광 소자용 수분 흡착제 및 그 제조 방법 |
CN201280034434.2A CN103797896B (zh) | 2011-07-14 | 2012-07-06 | 有机el元件用水分吸附剂及其制造方法 |
US14/131,241 US9115033B2 (en) | 2011-07-14 | 2012-07-06 | Moisture absorbent for organic electroluminescence element and production method for same |
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