JP2022130207A - 多孔質ハニカム構造体及びその製造方法 - Google Patents
多孔質ハニカム構造体及びその製造方法 Download PDFInfo
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- JP2022130207A JP2022130207A JP2021029261A JP2021029261A JP2022130207A JP 2022130207 A JP2022130207 A JP 2022130207A JP 2021029261 A JP2021029261 A JP 2021029261A JP 2021029261 A JP2021029261 A JP 2021029261A JP 2022130207 A JP2022130207 A JP 2022130207A
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- Prior art keywords
- cumulative
- honeycomb structure
- porous
- pore
- partition walls
- 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
Links
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Images
Classifications
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Abstract
Description
コージェライトを含有する多孔質ハニカム構造体であって、
多孔質ハニカム構造体の内部を通過し、多孔質隔壁によって区画される複数のセルチャンネルを有し、
多孔質隔壁は、水銀圧入法により測定される気孔率が45~60%であり、
多孔質隔壁は、水銀圧入法により測定される体積基準の累積細孔径分布において、小細孔側からの累積10%細孔径(D10)及び累積50%細孔径(D50)が、0.45≦(D50-D10)/D50の関係を満たし、且つ、3μm≦D50≦10μmである、
多孔質ハニカム構造体。
[2]
0.50≦(D50-D10)/D50である[1]に記載の多孔質ハニカム構造体。
[3]
多孔質隔壁は、水銀圧入法により測定される体積基準の累積細孔径分布において、小細孔側からの累積10%細孔径(D10)、累積50%細孔径(D50)及び累積90%細孔径(D90)が、1.3≦(D90-D10)/D50の関係を満たす[1]又は[2]に記載の多孔質ハニカム構造体。
[4]
1.7≦(D90-D10)/D50である[3]に記載の多孔質ハニカム構造体。
[5]
多孔質隔壁の厚みが、40~150μmである[1]~[4]の何れか一項に記載の多孔質ハニカム構造体。
[6]
多孔質隔壁は、共振法で測定されるヤング率が8~15GPaである[1]~[5]の何れか一項に記載の多孔質ハニカム構造体。
[7]
[1]~[6]の何れか一項に記載の多孔質ハニカム構造体の製造方法であって、
コージェライト化原料、有機造孔材、バインダー及び分散媒を含有する坏土を成形することで得られるハニカム成形体であって、当該ハニカム成形体の内部を通過し、隔壁によって区画される複数のセルチャンネルを有するハニカム成形体を得る工程と、
前記ハニカム成形体を焼成する工程と、
を含み、
有機造孔材は、ハニカム成形体中にコージェライト化原料100質量部に対して1.5質量部以上含まれ、レーザー回折・散乱法により測定される体積基準の累積粒度分布において、小粒子側からの累積10%粒子径(D10)及び累積50%粒子径(D50)が、0.32≦(D50-D10)/D50の関係を満たし、且つ、10μm≦D50≦30μmである、
製造方法。
[8]
有機造孔材は、レーザー回折・散乱法により測定される体積基準の累積粒度分布において、小粒子側からの累積10%粒子径(D10)、累積50%粒子径(D50)及び累積90%粒子径(D90)が、0.8≦(D90-D10)/D50の関係を満たす[7]に記載の製造方法。
本発明に係るコージェライトを含有する多孔質ハニカム構造体は一実施形態において、多孔質ハニカム構造体の内部を通過し、多孔質隔壁によって区画される複数のセルチャンネルを有する。当該多孔質ハニカム構造体は一実施形態において、ウォールスルー型又はウォールフロー型の柱状ハニカム構造体として提供される。当該多孔質ハニカム構造体の用途は特に制限はない。例示的には、ヒートシンク、フィルタ(例:GPF、DPF)、触媒担体、摺動部品、ノズル、熱交換器、電気絶縁用部材及び半導体製造装置用部品といった種々の産業用途に使用される。中でも、内燃機関、ボイラー等からの排ガス中に含まれる粒子状物質を捕集するフィルタや、排ガス浄化用触媒の触媒担体として好適に利用可能である。とりわけ、当該多孔質ハニカム構造体は、自動車用排ガスフィルタ及び/又は触媒担体として好適に利用可能である。
本発明の一実施形態に係る多孔質ハニカム構造体は、例えば以下の製造方法によって製造可能である。まず、コージェライト化原料、有機造孔材、バインダー、分散媒及び必要に応じてその他の添加剤(界面活性剤等)を含有する原料組成物を混練して坏土を形成する。次いで、坏土を成形することにより所望のハニカム成形体、典型的には柱状ハニカム成形体を作製する。成形方法としては押出成形が好適に使用可能である。押出成形に際して、所望の全体形状、セル形状、隔壁厚み、セル密度等を有する口金を用いることで、当該ハニカム成形体の内部を通過し、隔壁によって区画される複数のセルチャンネルを有するハニカム構造を構築可能である。
(1)コージェライトを含有する多孔質ハニカム構造体の製造
試験番号に応じて、表2に示す各質量割合で、コージェライト化原料(タルク、カオリン、アルミナ、水酸化アルミニウム、シリカ)、有機造孔材(ポリアクリル酸系のポリマー)、バインダー(ヒドロキシプロポキシルセルロース)、界面活性剤(脂肪酸石鹸)、及び水を混練して坏土を調製した。有機造孔材としては、粒度分布を調整した二種類のポリマーA、Bを使用した。
得られた多孔質ハニカム構造体の仕様は以下である。
全体形状:直径約132mm×高さ約90mmの円柱状
セルの流路方向に垂直な断面におけるセル形状:正方形
セル密度(単位断面積当たりのセルの数):表3参照
隔壁厚:表3参照(口金の仕様に基づく公称値)
上記の製造方法によって得られたコージェライトを含有する多孔質ハニカム構造体の多孔質隔壁の気孔率及び体積基準の累積細孔径分布(D10、D50、D90)を、水銀ポロシメータ(Micromeritics社製の商品名:AutoPore IV)を用いてJIS R1655:2003に規定されている水銀圧入法により測定した。水銀ポロシメータによる測定は、円柱状の多孔質ハニカム構造体の高さ方向中央部の中心付近と外周付近の2か所から試料(縦×横×高さ=約13mm×約13mm×約13mmの立方体)をそれぞれ採取して行い、その平均値を測定値とした。この際、コージェライトの真密度2.52g/cm3を使用した。各試験番号に係る多孔質ハニカム構造体について、気孔率及び細孔径分布の測定結果を表3に示す。
各試験番号に係る多孔質ハニカム構造体について、弾性率測定装置を用いてJIS R1602-1995に規定されている共振法により測定した。ヤング率(=曲げ共振法による弾性率)の測定は、円柱状の多孔質ハニカム構造体の高さ方向中央部の中心付近と外周付近の2か所から試料(幅×厚さ×長さ=約20mm×約10mm×約90mmの直方体)をそれぞれ採取して行い、その平均値を測定値とした。
各試験番号に係る多孔質ハニカム構造体について、以下の方法により耐熱衝撃性を測定した。結果を表3に示す。
1.多孔質ハニカム構造体を設定温度(初期設定温度=550℃)に保持された電気炉に1200秒間入れる。
2.多孔質ハニカム構造体を電気炉から取り出し、室温の耐熱レンガの上に置き、15分間自然放置する。
3.15分後、冷却ファンを使用して多孔質ハニカム構造体の温度を室温まで下げる。
4.目視によるクラックの有無確認を行う。
5.クラック無ならば合格。
6.クラック無の場合は、1.の設定温度を50℃ずつ上げてクラックが入るまで上記手順を繰り返し、「クラック発生温度-50℃」を測定値とする。
表3に示す結果から分かるように、実施例1~6、比較例1~4はそれぞれ、3μm≦D50≦10μmの条件を満たしており、全体としては細孔径が小さい。しかしながら、実施例1~6においては、更に0.45≦(D50-D10)/D50の関係を満たし、細孔径分布が広いことで、耐熱衝撃性が比較例1~4に比べて顕著に向上していることが分かる。そして、実施例1~6の中でも、0.50≦(D50-D10)/D50を満たす実施例1~4は特に耐熱衝撃性が優れていたことが分かる。
102 外周側壁
103 側面
104 第一底面
106 第二底面
108 セル
112 隔壁
200 柱状ハニカム構造体
202 外周側壁
203 側面
204 第一底面
206 第二底面
208a 第1セル
208b 第2セル
212 隔壁
Claims (8)
- コージェライトを含有する多孔質ハニカム構造体であって、
多孔質ハニカム構造体の内部を通過し、多孔質隔壁によって区画される複数のセルチャンネルを有し、
多孔質隔壁は、水銀圧入法により測定される気孔率が45~60%であり、
多孔質隔壁は、水銀圧入法により測定される体積基準の累積細孔径分布において、小細孔側からの累積10%細孔径(D10)及び累積50%細孔径(D50)が、0.45≦(D50-D10)/D50の関係を満たし、且つ、3μm≦D50≦10μmである、
多孔質ハニカム構造体。 - 0.50≦(D50-D10)/D50である請求項1に記載の多孔質ハニカム構造体。
- 多孔質隔壁は、水銀圧入法により測定される体積基準の累積細孔径分布において、小細孔側からの累積10%細孔径(D10)、累積50%細孔径(D50)及び累積90%細孔径(D90)が、1.3≦(D90-D10)/D50の関係を満たす請求項1又は2に記載の多孔質ハニカム構造体。
- 1.7≦(D90-D10)/D50である請求項3に記載の多孔質ハニカム構造体。
- 多孔質隔壁の厚みが、40~150μmである請求項1~4の何れか一項に記載の多孔質ハニカム構造体。
- 多孔質隔壁は、共振法で測定されるヤング率が8~15GPaである請求項1~5の何れか一項に記載の多孔質ハニカム構造体。
- 請求項1~6の何れか一項に記載の多孔質ハニカム構造体の製造方法であって、
コージェライト化原料、有機造孔材、バインダー及び分散媒を含有する坏土を成形することで得られるハニカム成形体であって、当該ハニカム成形体の内部を通過し、隔壁によって区画される複数のセルチャンネルを有するハニカム成形体を得る工程と、
前記ハニカム成形体を焼成する工程と、
を含み、
有機造孔材は、ハニカム成形体中にコージェライト化原料100質量部に対して1.5質量部以上含まれ、レーザー回折・散乱法により測定される体積基準の累積粒度分布において、小粒子側からの累積10%粒子径(D10)及び累積50%粒子径(D50)が、0.32≦(D50-D10)/D50の関係を満たし、且つ、10μm≦D50≦30μmである、
製造方法。 - 有機造孔材は、レーザー回折・散乱法により測定される体積基準の累積粒度分布において、小粒子側からの累積10%粒子径(D10)、累積50%粒子径(D50)及び累積90%粒子径(D90)が、0.80≦(D90-D10)/D50の関係を満たす請求項7に記載の製造方法。
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