JP2011524846A - セラミック押出のためのセルロースエーテル含有添加物 - Google Patents
セラミック押出のためのセルロースエーテル含有添加物 Download PDFInfo
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- JP2011524846A JP2011524846A JP2011514135A JP2011514135A JP2011524846A JP 2011524846 A JP2011524846 A JP 2011524846A JP 2011514135 A JP2011514135 A JP 2011514135A JP 2011514135 A JP2011514135 A JP 2011514135A JP 2011524846 A JP2011524846 A JP 2011524846A
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Classifications
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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
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- C04B33/13—Compounding ingredients
- C04B33/1305—Organic additives
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C04B35/46—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on titanium oxides or titanates
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Abstract
Description
アルミナ;窒化アルミニウム及び炭化アルミニウム;カオリン;コーディエライト;ムライト;炭化ケイ素;ホウ化ケイ素;窒化ケイ素;二酸化チタン;炭化チタン;炭化ホウ素;酸化ホウ素;ケイ酸塩及び層状ケイ酸塩、例えば、タルクなど;ケイ素金属;炭素、例えば、カーボンブラック又はグラファイトなど;粉末ガラス;他の金属酸化物、例えば、希土類酸化物など;ゼオライト及び関連した物質など。特定の他の酸化物とは、粘土と混合されたとき、コーディエライト又はムライトを形成する酸化物である(例えば、コーディエライトを形成するためのシリカ及びタルク、並びにムライトを形成するときにはアルミナ)。
最初に、粘土、すなわちコーディエライトCP820M(Imerys Tableware、ドイツ)から構成されるコーディエライト配合物の100重量部と、本発明による添加物の(100重量部のコーディエライト配合物に基づいて)1重量部とを均質な混合物が形成されるまで流動床ミキサー(これはLodige(ドイツ)によって製造される)で乾式混合した。続いて20℃での水を加え、素材をさらに混合し、ニーダー(これはAMK(Aachen、ドイツ)によって製造される)で数分間混練した。その後、素材を、20℃で維持される水冷の単軸スクリュー押出機(Handle 8D、スクリュー直径:8cm、これはHandle(Muhlacker(ドイツ)から得られる)の供給トラフに直ちに導入した。素材を穴あきプレートに通して押出、消ガスのために真空チャンバに通した。その場合、素材は最初に引っ張られ(すなわち、凝集物の素材をなくすために、0.4mm又は0.2mmのメッシュサイズを有するふるいに通され)、続いて、ダイから押出され(平坦な異形材、4cm×1cm)、コンベヤーベルトの上に排出された。異形材の得られた凝集強度及び生強度を測定するために、コンベヤーベルトの上を流れる異形材を、ベルトの終点を通過した後もベルトの上を水平方向に流れることを続けさせた。ベルトの終点の「上に張り出す」異形材の長さを、ベルトがそれ自身の重量により裂ける前に測定した。下記の表は、同じ試験から得られる、異形材の少なくとも10個の続いて押出された部分の最小測定長さ及び最大測定長さを示す。水の量(W/S=0.32は、1Kgのコーディエライト配合物あたり0.32Kgの水を意味する)が、特定のバッチサイズに対して一定で保たれた(各バッチは5kgのコーディエライト配合物及び1.6kgの水を含有した)。水の量には、水に加えられたHCl及び/又はアンモニアの量が含まれる。
W/Sは水/固形物係数を意味し、これは100部の固形物(S)に対する水の量(W)を意味する。使用される水の量は、コーディエライトに基づいてのみ計算された。
試験1(コンパウンド系)と、試験9(100%のセルロースエーテルによる100:0:0系)との比較では、コンパウンド系に変えることによるpH7における生強度における改善が示される:異形材の長さが11.5cm〜13.5cmから17cmに増大した。pHを両方の系においてアルカリ性条件に変化させることによって、生強度が増大し(純粋なセルロースエーテル系においては試験9及び試験10を参照のこと、セルロースエーテル系においては試験1及び試験2〜試験5を参照のこと)、しかし、コンパウンド系では、効果が、純粋なセルロースエーテル系の場合よりもはるかに大きい(試験3及び試験10を比較のこと。両者とも、25gのNH3を添加することによって行われた)。これらの結果は、ベルトの上に張り出る異形材の長さが、7を超えるpHとともに増大し続けることを明瞭に示す。このことは結果として、セラミック素材を作製するために使用される水のpHが7を超える場合に凝集強度及び生強度が増大することを意味する。酸性条件(試験1を試験6〜試験8と比較されたい)は生強度を低下させ、すべての場合において、押出された異形材の端部で亀裂形成を引き起こし、同様にまた、ダイ及び圧力センサーにおいて水分損失を引き起こす。水分損失の増大は、系の水分保持低下の明瞭な目安であり、このことは、より大きい摩擦押出圧力を引き起こす、高密度化のための押出機における残留する素材を引き起こす可能性があり、このことは、さらなる水分損失を引き起こし得、最終的に押出プロセス全体を破損させ得る。
Claims (15)
- 焼成又は焼結を受けて硬化するセラミック素材又は他の素材を押出するためのプロセスであって、焼成又は焼結を受けて硬化する、粘土から構成されるセラミック素材を、個々の成分又は予備混合された添加物としての(A)少なくとも1つのセルロースエーテルと(B)少なくとも1つの可塑剤と(C)少なくとも1つの消泡剤、及び(D)pH7を超える水と混合すること、次いでそれを押出することを含む、プロセス。
- 粘土から構成される前記セラミック素材が、コーディエライト又はムライトを加熱したときに形成する、請求項1に記載のプロセス。
- 2重量%の水溶液において20℃で求められる400mPa・s〜200000mPa・sの粘度を有するセルロースエーテルがセルロースエーテル(A)として使用される、請求項1又は2に記載のプロセス。
- ポリカルボン酸コポリマー及び/又はその塩が可塑剤(B)として使用される、請求項1から3のいずれか一項に記載のプロセス。
- ポリエーテル系消泡剤が消泡剤(C)として使用される、請求項1から4のいずれか一項に記載のプロセス。
- アルキレングリコールのホモポリマー、コポリマー、ターポリマー又はブロックコポリマーが、ポリエーテル系消泡剤として使用される、請求項5に記載のプロセス。
- (A)、(B)及び(C)の総量に基づいて、成分(A)の割合が10重量%〜91重量%であり、成分(B)の割合が8重量%〜70重量%であり、かつ、成分(C)の割合が1重量%〜20重量%である、請求項1から6のいずれか一項に記載のプロセス。
- 混合物とみなされる(A)、(B)及び(C)の使用量が、焼成又は焼結を受けて硬化するセラミック素材又は他の素材の配合物全体に基づいて1重量%〜8重量%である、請求項1から7のいずれか一項に記載のプロセス。
- 押出物の熱処理が押出後に行われる、請求項1から8のいずれか一項に記載のプロセス。
- 請求項1から9のいずれか一項に記載のプロセスによって得ることができる押出物。
- 排気ガス処理のためのハニカム本体としての、又は、触媒としての、請求項10に記載の押出物の使用。
- 焼成又は焼結を受けて硬化する、粘土から構成されるセラミック素材であって、(A)少なくとも1つのセルロースエーテル、(B)少なくとも1つの可塑剤、(C)少なくとも1つの消泡剤、及び(D)pH7を超える水を含むセラミック素材。
- 前記水のpHが少なくとも9である、請求項1に記載の方法。
- 前記水のpHがアンモニアの添加によって調節される、請求項1に記載の方法。
- 前記消泡剤がシリコーン系消泡剤を含む、請求項1に記載の方法。
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US8968639B2 (en) | 2010-04-26 | 2015-03-03 | Dow Global Technologies Llc | Composition for extrusion-molded bodies |
US9353011B2 (en) | 2010-11-08 | 2016-05-31 | Dow Global Technologies Llc | Composition for extrusion-molded bodies comprising a methyl cellulose |
KR20120079729A (ko) * | 2011-01-05 | 2012-07-13 | 삼성정밀화학 주식회사 | Scr 촉매의 세라믹 담체용 유기 바인더 조성물 및 이를 포함하는 scr 촉매용 세라믹 담체 |
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RU2560048C1 (ru) * | 2014-06-06 | 2015-08-20 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Казанский государственный архитектурно-строительный университет" КГАСУ | Модифицированная легкоплавкая глинистая масса |
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KR20110020266A (ko) | 2011-03-02 |
MX2010014095A (es) | 2011-01-21 |
CN102066284A (zh) | 2011-05-18 |
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