JPH07138077A - Production of cordierite honeycomb structure - Google Patents
Production of cordierite honeycomb structureInfo
- Publication number
- JPH07138077A JPH07138077A JP5286638A JP28663893A JPH07138077A JP H07138077 A JPH07138077 A JP H07138077A JP 5286638 A JP5286638 A JP 5286638A JP 28663893 A JP28663893 A JP 28663893A JP H07138077 A JPH07138077 A JP H07138077A
- Authority
- JP
- Japan
- Prior art keywords
- cordierite
- honeycomb structure
- weight
- ceramic
- viscosity
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/636—Polysaccharides or derivatives thereof
- C04B35/6365—Cellulose or derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コージェライトハニカ
ム構造体を押出成形して製造する方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cordierite honeycomb structure by extrusion molding.
【０００２】[0002]
【従来の技術】従来、一般的にコージェライトハニカム
構造体は、格子状の溝からなる排出通路とこの溝の交点
にセラミックス坏土を分割供給する送供通路とを備えた
構造を有するセラミックス構造体押出用口金を使用し
て、セラミックス原料、溶媒、有機バインダーや界面活
性剤等の成形助剤を必要に応じて混合、混練して得たセ
ラミックス坏土を押出成形していた。2. Description of the Related Art Conventionally, a cordierite honeycomb structure generally has a ceramic structure having a discharge passage formed of lattice-shaped grooves and a supply passage for dividing and supplying the ceramic kneaded clay at intersections of the grooves. A ceramic body obtained by mixing and kneading a ceramic raw material, a solvent, a molding aid such as an organic binder, a surfactant, and the like as needed using a body extrusion die was extruded.
【０００３】その一例として、アルミナ、カオリン、タ
ルクを含有するコージェライト組成のセラミックス坏土
を押出成形によってコージェライトハニカム構造体とし
た場合、カオリン、タルク等の板状結晶が押出成形時に
せん断応力を受けて配向し、この配向した原料にコージ
ェライト結晶が生成されるため、きわめて熱膨張係数の
小さいハニカム構造体が製造できる。このように熱膨張
係数の小さいコージェライト組成の押出成形ハニカム構
造体は、耐熱衝撃性が必要な自動車排ガスや火力発電所
等の排ガスの浄化用触媒担体として使用されている。As an example, when a ceramic kneaded clay having a cordierite composition containing alumina, kaolin and talc is extruded to form a cordierite honeycomb structure, plate-like crystals of kaolin, talc and the like cause shear stress during extrusion. Since it receives and is oriented, and cordierite crystals are generated in the oriented material, a honeycomb structure having an extremely small thermal expansion coefficient can be manufactured. Such an extruded honeycomb structure having a cordierite composition having a small coefficient of thermal expansion is used as a catalyst carrier for purifying exhaust gas from automobiles, thermal power plants, and the like, which require thermal shock resistance.
【０００４】このセラミックス坏土形成のために使用す
る成形助剤として、粘度が２５０００〜１０００００ｃ
ｐｓで高温でゲル化できる有機バインダーを添加するこ
とが、例えば特開昭６０−２３９２０７号公報において
開示されている。A viscosity of 25,000 to 100,000c is used as a molding aid used for forming the ceramic kneaded clay.
The addition of an organic binder capable of gelling at high temperature in ps is disclosed in, for example, JP-A-60-239207.
【０００５】[0005]
【発明が解決しようとする課題】このように、セラミッ
クス坏土を、上述した格子状の溝からなる排出通路とこ
の溝の交点に坏土を分割供給する送供通路とを備えた口
金を通過させることにより押出成形する場合、上述した
従来のセラミックス坏土を使用すると、押出後のハニカ
ム構造体がその自重により変形するか、または、その後
の工程で発生する振動などによる外力により容易に変形
してしまう問題があった。As described above, the ceramic kneaded material is passed through the die having the discharge passage formed of the above-mentioned grid-like grooves and the supply and supply passage for separately feeding the kneaded material at the intersection of the grooves. When the above-mentioned conventional ceramic kneaded material is used for extrusion molding, the honeycomb structure after extrusion is deformed by its own weight or is easily deformed by an external force such as vibration generated in the subsequent process. There was a problem that caused it.
【０００６】これらの現象は、セラミックス坏土の硬度
が低い程顕著に発生する。しかし、ただ単にセラミック
ス坏土の硬度を高くすると、流動性が低下するため外周
部表面が粗面となり表面がめくれたり、亀裂が生じてし
まう問題があった。また、成形した構造体を乾燥する際
に水分蒸発による収縮が不均一となり、ハニカム構造体
の内部と外周部とで収縮差によりクラックが生じる問題
があった。[0006] These phenomena are more remarkable as the hardness of the ceramic kneaded clay is lower. However, if the hardness of the ceramic kneaded material is simply increased, the fluidity is lowered, so that the outer peripheral surface becomes a rough surface, and there is a problem that the surface is turned over or cracks occur. In addition, when the molded structure is dried, the shrinkage due to water evaporation becomes non-uniform, and there is a problem that cracks occur due to the difference in shrinkage between the inside and the outer peripheral portion of the honeycomb structure.
【０００７】本発明の目的は上述した課題を解消して、
セラミックス坏土が口金を通過する際の流動性を保ちつ
つ補形成が良いだけでなく、乾燥時にクラックが発生し
ないコージェライトハニカム構造体の製造方法を提供し
ようとするものである。The object of the present invention is to solve the above problems,
An object of the present invention is to provide a method for manufacturing a cordierite honeycomb structure, which not only has good formation while maintaining fluidity when the ceramic kneaded material passes through the die, but also does not cause cracks during drying.
【０００８】[0008]
【課題を解決するための手段】本発明のコージェライト
ハニカム構造体の製造方法は、コージェライト原料に、
粘度が２％水溶液中、２０℃で８０００センチポイズ
(ｃＰ）以上で、グルコース環単位中の水酸基がメトキ
シル基で置換された平均個数（ＤＳ）からグルコース環
単位当たりに付加したヒドロキシプロポキシル基のモル
数（ＭＳ）を引いた数が１．５以上となるメチルセルロ
ースを２〜７重量％添加して、押出成形可能に可塑化し
たセラミックス坏土を押出成形すること特徴とし、さら
に粘度が２％水溶液中、２０℃で８０００センチポイズ
(ｃＰ）未満のメチルセルロースを０．５重量％以上３
重量％以下混合し、メチルセルロースの総添加量を２〜
７重量％とすることを特徴とするものである。The method for producing a cordierite honeycomb structure of the present invention comprises:
Viscosity in 2% aqueous solution at 20 ° C 8000 centipoise
(cP) or more, the number obtained by subtracting the number of moles (MS) of hydroxypropoxyl groups added per glucose ring unit from the average number (DS) in which the hydroxyl group in the glucose ring unit is substituted with a methoxyl group is 1.5. The above-mentioned methyl cellulose is added in an amount of 2 to 7% by weight to extrude a ceramic kneaded clay which is plasticized to be extrudable. Further, the viscosity is 8000 centipoise at 20 ° C. in a 2% aqueous solution.
0.5% by weight or more of methyl cellulose less than (cP) 3
Mixing up to 2% by weight, the total amount of methyl cellulose added is 2 to
It is characterized by being 7% by weight.
【０００９】また、本発明のコージェライトハニカム構
造体の製造方法は、コージェライト原料に、粘度が２％
水溶液中、２０℃で８０００センチポイズ (ｃＰ）以上
で、熱ゲル化温度が６５℃以下であるアルキシセルロー
スを２〜７重量％添加して、押出成形可能に可塑化した
セラミックス坏土を押出成形することを特徴とするもの
である。なお、アルキシセルロースとは、メチルセルロ
ース、エチルセルロースなどの他、ヒドロキシプロポキ
シルセルロースなどのアルキシセルロース誘導体を含
む。In the method for manufacturing a cordierite honeycomb structure of the present invention, the cordierite raw material has a viscosity of 2%.
In an aqueous solution, 2 to 7% by weight of axycellulose having a thermal gelation temperature of 65 ° C. or less at 8,000 centipoise (cP) or more at 20 ° C. is added to extrude a plasticized ceramic body capable of extrusion molding. It is characterized by doing. In addition, the alkyloxycellulose includes methylcellulose, ethylcellulose and the like, as well as an hydroxycellulose derivative such as hydroxypropoxyl cellulose.
【００１０】[0010]
【作用】上述した構成において、本発明は、コージェラ
イトハニカム構造体押出用のセラミックス坏土に添加す
る成形助剤として、所定の特性のアルキシセルロースを
所定量使用することで、セラミックス坏土が口金を通過
する際の流動性を保ちつつ保形性が良いだけでなく、乾
燥時にクラックが発生しないコージェライトハニカム構
造体を得ることができることを見い出したことによる。In the above-mentioned structure, the present invention provides a ceramic kneaded clay by using a predetermined amount of alexicellulose having predetermined characteristics as a forming aid to be added to the ceramic kneaded clay for extruding the cordierite honeycomb structure. It is based on the finding that it is possible to obtain a cordierite honeycomb structure which not only has good shape retention properties while maintaining fluidity when passing through a die, but also has no cracks during drying.
【００１１】[0011]
【実施例】本発明の製造方法を適用するコージェライト
ハニカム構造体は、以下のようにして得ることができ
る。まず、従来から低熱膨張コージェライトセラミック
スの組成として知られているコージェライト理論組成点
（２ＭｇＯ・２Ａｌ 2 Ｏ3 ・５ＳｉＯ2 ）を中心とした
ＳｉＯ2 ：４２〜５６重量％、好ましくは４７〜５３重
量％、Ａｌ2 Ｏ3 ：３０〜４５重量％、好ましくは３２
〜３８重量％、ＭｇＯ：１２〜１６重量％、好ましくは
１２．５〜１５重量％の領域となるように、タルク、カ
オリン、アルミナ、及び他のコージェライト化原料を調
合する。EXAMPLES Cordierite to which the manufacturing method of the present invention is applied
The honeycomb structure can be obtained as follows.
It First, the conventional low thermal expansion cordierite ceramic
Cordierite theoretical composition point known as the composition of
(2MgO · 2Al 2 O3 ・ 5 SiO2 )
SiO2 : 42 to 56 weight%, preferably 47 to 53 weight
%, Al2 O3 : 30 to 45% by weight, preferably 32
~ 38 wt%, MgO: 12-16 wt%, preferably
The talc and carb should be in the range of 12.5-15% by weight.
Prepared Orin, Alumina, and other cordierite raw materials
To meet.
【００１２】次に、この混合物に、粘度が２％水溶液
中、２０℃で８０００センチポイズ (ｃＰ）以上で、グ
ルコース環単位中の水酸基がメトキシル基で置換された
平均個数（ＤＳ）からグルコース環単位当たりに付加し
たヒドロキシプロポキシル基のモル数（ＭＳ）を引いた
数が１．５以上となるメチルセルロースを２〜７重量％
添加して、押出成形可能に可塑化したセラミックス坏土
を押出成形後に乾燥してセラミックスハニカム構造体を
得ている。そして、２〜７重量％のメチルセルロースの
一部を、粘度が２％水溶液中、２０℃で８０００センチ
ポイズ(ｃＰ）未満のメチルセルロース０．５重量％以
上３重量％以下と混合して、押出成形可能に可塑化した
セラミックス坏土を調整する。Next, in this mixture, the viscosity of a glucose ring unit was calculated from the average number (DS) in which the hydroxyl group in the glucose ring unit was substituted with a methoxyl group in a 2% aqueous solution at 20 ° C. of 8,000 centipoise (cP) or more. 2 to 7% by weight of methylcellulose whose number obtained by subtracting the number of moles (MS) of hydroxypropoxyl groups added per unit is 1.5 or more
The ceramic kneaded clay that has been added and plasticized to be extrudable is then extruded and dried to obtain a ceramic honeycomb structure. Then, a part of 2 to 7 wt% of methyl cellulose is mixed with 0.5 wt% to 3 wt% of methyl cellulose having a viscosity of less than 8000 centipoise (cP) at 20 ° C. in an aqueous solution of 2%, and extrusion molding is possible. Adjust the plasticized ceramic clay.
【００１３】以下、実際の例について説明する。まず、
以下の表１に示す有機バインダーをセラミック原料に混
合混練して特性の異なるセラミックス坏土を準備した。
試料ＮＯ．１〜９は比較例を、試料ＮＯ．１０〜１５は
本発明の実施例を示す。また、表２は２種類のバインダ
ーを混合した本発明の実施例を示す。なお、粘度は、２
％水溶液の２０℃で東機産業製ＢＬ型粘度計で測定し
た。熱ゲル化温度は、２％水溶液の粘度、温度を低温か
ら高温に上昇させながら測定し、増粘開始温度を熱ゲル
化温度と定義した。An actual example will be described below. First,
The organic binders shown in Table 1 below were mixed and kneaded with ceramic raw materials to prepare ceramic kneaded clay having different characteristics.
Sample No. Sample Nos. 1 to 9 are comparative examples. 10 to 15 show examples of the present invention. Table 2 shows examples of the present invention in which two kinds of binders are mixed. The viscosity is 2
% Aqueous solution was measured at 20 ° C. with a Toki Sangyo BL-type viscometer. The thermal gelation temperature was measured while increasing the viscosity of the 2% aqueous solution and the temperature from low temperature to high temperature, and the thickening start temperature was defined as the thermal gelation temperature.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】表１および表２に示したセラミックス坏土
の試料ＮＯ．１〜１８の各種特性を表３に示す。表３に
示す各種特性のうち、進入抵抗は直径５ｍｍの円球を一
定時間坏土に進入させたときの抵抗値をレオメータによ
り測定したものである。保形性は、一定の長さにハニカ
ム構造体（壁厚：１４０μm 、セル密度：４００セル／
ｉｎ2 、３０ｍｍ角）を押し出し、その長さの中央部に
荷重を与え、その変形抵抗を座屈強度として求め、この
値が高いものを○、悪いものを×として表記した。従っ
て、座屈強度の低いもの程、自重や外力により変形しや
すいものである。Sample Nos. Of the ceramic kneaded clay shown in Tables 1 and 2. Table 3 shows various characteristics 1 to 18. Among the various characteristics shown in Table 3, the penetration resistance is a resistance value measured by a rheometer when a sphere having a diameter of 5 mm is allowed to enter the kneaded clay for a certain period of time. The shape-retaining property is that the honeycomb structure has a certain length (wall thickness: 140 μm, cell density: 400 cells /
(in 2 , 30 mm square) was extruded, a load was applied to the central portion of the length, and the deformation resistance thereof was determined as buckling strength. Therefore, the lower the buckling strength, the easier it is to be deformed by its own weight or external force.
【００１７】外壁表面は、坏土と金属壁面との摩擦抵抗
により生じた表面のめくれや亀裂が無いものを○、多い
ものを×として表記した。乾燥クラックは外周部表面及
び内部セルにクラックが無いものを○、多いものを×と
して表記した。さらに、全体の判定は、保形性、外壁表
面、乾燥クラックのいずれも優れているものを○、いず
れか１つでも×のあるものを×として表記した。As for the outer wall surface, those having no surface turning or cracking caused by the frictional resistance between the kneaded clay and the metal wall surface are indicated by ◯, and many are indicated by x. The dry cracks are indicated by ◯ when there are no cracks on the outer peripheral surface and inside cells, and by x when there are many. Further, in the overall judgment, those having excellent shape-retaining property, outer wall surface, and dry crack were marked with ◯, and any one having x was marked with x.
【００１８】[0018]
【表３】 [Table 3]
【００１９】以上の結果から、コージェライト化原料を
調合しこの混合物に２％濃度の水溶液中、２０℃で粘度
が８０００センチポイズ（ｃＰ）以上で、グルコース環
単位中の水酸基がメトキシル基で置換された平均個数
（ＤＳ）からグルコース環単位当たりに付加したヒドロ
キシプロポキシル基のモル数（ＭＳ）を引いた数が１．
５以上となるメチルセルロースを２〜７重量％添加し
て、押出成形可能に可塑化したセラミックス坏土を押出
成形することにより、外壁表面のめくれや亀裂が発生す
ることなく、保形性を向上することができ、また、乾燥
時に乾燥クラックが発生することなく良好なコージェラ
イトハニカム構造体を得ることができることがわかる。
ＤＳ−ＭＳの値は好ましくは１．５以上３以下である。From the above results, a cordierite forming raw material was prepared, and in this mixture, a 2% aqueous solution having a viscosity of 8,000 centipoise (cP) or more at 20 ° C. was substituted for the hydroxyl group in the glucose ring unit with a methoxyl group. The number obtained by subtracting the number of moles (MS) of hydroxypropoxyl groups added per glucose ring unit from the average number (DS) was 1.
By adding 2 to 7% by weight of methylcellulose of 5 or more and extruding a ceramic kneaded clay plasticized to be extrudable, shape retention is improved without causing the outer wall surface to be turned or cracked. It can be seen that a good cordierite honeycomb structure can be obtained without causing drying cracks during drying.
The value of DS-MS is preferably 1.5 or more and 3 or less.
【００２０】また、試料ＮＯ．３の比較例に示されるよ
うに、保形性を向上させるために、ただ単に硬度を高く
すると、セラミックス坏土と金属壁面との摩擦抵抗によ
り表面のめくれや亀裂が生じることがわかった。さら
に、グルコース環単位中の水酸基がメトキシル基で置換
された平均個数（ＤＳ）からグルコース環単位当たりに
付加したヒドロキシプロポキシル基のモル数（ＭＳ）を
引いた数が１．５未満の場合、乾燥時に乾燥クラックが
発生した。これは、バインダーとしてのメチルセルロー
スのゲル化温度が高いため、ゲル化による固化が完全に
進む前に、水分蒸発に伴う収縮が生じ、セラミックス構
造体の外周部と内部に収縮差が生じたことによる。従っ
て、混練した押出成形用混練物の熱ゲル化温度は６５℃
であることが好ましい。Further, the sample No. As shown in Comparative Example 3 above, it was found that if the hardness is simply increased in order to improve the shape retention, the surface is turned up or cracked due to the frictional resistance between the ceramic kneaded clay and the metal wall surface. Furthermore, when the number obtained by subtracting the number of moles (MS) of hydroxypropoxyl groups added per glucose ring unit from the average number (DS) in which the hydroxyl group in the glucose ring unit is substituted with a methoxyl group is less than 1.5, Drying cracks occurred during drying. This is because the high gelation temperature of methyl cellulose as a binder causes shrinkage due to water evaporation before solidification due to gelation completely proceeds, resulting in a difference in shrinkage between the outer peripheral portion and the inner portion of the ceramic structure. . Therefore, the thermal gelation temperature of the kneaded mixture for extrusion molding is 65 ° C.
Is preferred.
【００２１】さらに、メチルセルロースの粘度は、好ま
しくは２％水溶液中、２０℃で８０００ｃＰ〜２０００
０ｃＰの範囲であるとさらに保形性が良く、乾燥クラッ
クが発生せず、良好なコージェライトハニカム構造体を
得ることができる。粘度が２％水溶液中２０℃で３００
００ｃＰを超えると混練素地が硬くなり、金属壁面との
摩擦抵抗により表面のめくれや亀裂が生じる。Further, the viscosity of methylcellulose is preferably 8000 cP to 2000 at 20 ° C. in a 2% aqueous solution.
Within the range of 0 cP, the shape retention is further improved, dry cracks do not occur, and a good cordierite honeycomb structure can be obtained. Viscosity 300% at 20 ℃ in 2% aqueous solution
If it exceeds 00 cP, the kneading base becomes hard and the surface is turned or cracked due to the frictional resistance with the metal wall surface.
【００２２】さらにまた、２％濃度の水溶液中、２０℃
の粘度が１５００ｃＰ以上８０００ｃＰ以下のメチルセ
ルロースを０．５重量％以上３重量％以下添加して、メ
チルセルロースの総添加量を２〜７重量％とした場合、
外壁表面のめくれや亀裂が発生することなく、保形性を
向上することができ、さらに乾燥クラックも発生しなか
った。上述の効果は、ハニカム構造体のセル壁厚が１４
０μm 以下の場合により好ましくは１２０μm 以下の場
合に顕著に得ることができた。また、ヒドロキシプロポ
キシル基が付加されることにより、粘性が増加する傾向
にあり、さらに保水性が向上するため坏土への分散性が
良くなる。Furthermore, in a 2% aqueous solution at 20 ° C.
When the total addition amount of methylcellulose is 2 to 7% by weight by adding 0.5% by weight to 3% by weight of methylcellulose having a viscosity of 1500 cP or more and 8000 cP or less,
It was possible to improve the shape-retaining property without causing the outer wall surface to be turned over or cracked, and further, dry cracks were not generated. The above effect is obtained when the cell wall thickness of the honeycomb structure is 14
It can be remarkably obtained in the case of 0 μm or less, and more preferably in the case of 120 μm or less. Further, the addition of the hydroxypropoxyl group tends to increase the viscosity, and further improves the water retention, so that the dispersibility in the kneaded clay is improved.
【００２３】[0023]
【発明の効果】以上の説明から明らかなように、本発明
によれば、セラミックス坏土の組成を限定することによ
って、コージェライトハニカム構造体の外壁表面がめく
れたり亀裂が発生することなく、保形性を向上すること
ができ、さらに、乾燥時に乾燥クラックが発生すること
なく、良好なコージェライトハニカム構造体を得ること
ができる。As is apparent from the above description, according to the present invention, by limiting the composition of the ceramic kneaded clay, the outer wall surface of the cordierite honeycomb structure is prevented from being turned or cracked. The formability can be improved, and a good cordierite honeycomb structure can be obtained without causing drying cracks during drying.
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成６年１１月２８日[Submission date] November 28, 1994
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００７[Correction target item name] 0007
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００７】本発明の目的は上述した課題を解消して、
セラミックス坏土が口金を通過する際の流動性を保ちつ
つ保形性が良いだけでなく、乾燥時にクラックが発生し
ないコージェライトハニカム構造体の製造方法を提供し
ようとするものである。The object of the present invention is to solve the above problems,
An object of the present invention is to provide a method for producing a cordierite honeycomb structure, which not only has good shape retention while maintaining fluidity when the ceramic kneaded material passes through the die, but also does not cause cracks during drying.
Claims (4)
中、２０℃で８０００センチポイズ (ｃＰ）以上で、グ
ルコース環単位中の水酸基がメトキシル基で置換された
平均個数（ＤＳ）からグルコース環単位当たりに付加し
たヒドロキシプロポキシル基のモル数（ＭＳ）を引いた
数が１．５以上となるメチルセルロースを２〜７重量％
添加して、押出成形可能に可塑化したセラミックス坏土
を押出成形することを特徴とするコージェライトハニカ
ム構造体の製造方法。1. A cordierite raw material having a viscosity of 2% in an aqueous solution at 20 ° C. of not less than 8,000 centipoise (cP) and an average number (DS) of glucose ring units substituted with methoxyl groups to glucose ring units. 2 to 7% by weight of methylcellulose whose number obtained by subtracting the number of moles (MS) of hydroxypropoxyl groups added per unit is 1.5 or more
A method for producing a cordierite honeycomb structure, which comprises adding and extrusion-molding a ceramic kneaded clay that has been plasticized to be extrusion-moldable.
ンチポイズ (ｃＰ）未満のメチルセルロースを０．５重
量％以上３重量％以下混合し、メチルセルロースの総添
加量を２〜７重量％とした請求項１記載のコージェライ
トハニカム構造体の製造方法。2. A methyl cellulose having a viscosity of less than 8000 centipoise (cP) at 20 ° C. in an aqueous solution of 2% is mixed in an amount of 0.5% by weight or more and 3% by weight or less, and the total addition amount of methylcellulose is set to 2 to 7% by weight. The method for manufacturing a cordierite honeycomb structure according to claim 1.
中、２０℃で８０００センチポイズ (ｃＰ）以上で、熱
ゲル化温度が６５℃以下であるアルキシセルロースを２
〜７重量％添加して、押出成形可能に可塑化したセラミ
ックス坏土を押出成形することを特徴とするコージェラ
イトハニカム構造体の製造方法。3. A cordierite raw material is a 2% aqueous solution of axycellulose having a viscosity of 8,000 centipoise (cP) or more at 20 ° C. and a thermal gelation temperature of 65 ° C. or less.
A method for producing a cordierite honeycomb structure, which comprises adding ~ 7% by weight and extruding a ceramic kneaded clay plasticized to be extrudable.
下である請求項１〜３のいずれかに記載のセラミックス
構造体の製造方法。4. The method for producing a ceramic structure according to claim 1, wherein the honeycomb structure has a cell wall thickness of 140 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28663893A JP3227039B2 (en) | 1993-11-16 | 1993-11-16 | Method for manufacturing cordierite honeycomb structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28663893A JP3227039B2 (en) | 1993-11-16 | 1993-11-16 | Method for manufacturing cordierite honeycomb structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07138077A true JPH07138077A (en) | 1995-05-30 |
| JP3227039B2 JP3227039B2 (en) | 2001-11-12 |
Family
ID=17707013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28663893A Expired - Lifetime JP3227039B2 (en) | 1993-11-16 | 1993-11-16 | Method for manufacturing cordierite honeycomb structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3227039B2 (en) |
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| JP2000327409A (en) * | 1999-05-24 | 2000-11-28 | Nippon Soken Inc | Cordierite honeycomb structure and its production |
| EP1316538A1 (en) * | 2000-07-31 | 2003-06-04 | Ngk Insulators, Ltd. | Method for producing honeycomb structure |
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| JPWO2007111281A1 (en) * | 2006-03-23 | 2009-08-13 | 日本碍子株式会社 | Honeycomb structure, manufacturing method thereof, and bonding material |
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| US20050221974A1 (en) | 2004-03-31 | 2005-10-06 | Ngk Insulators, Ltd. | Ceramic clay, ceramic formed article, ceramic structure, and manufacturing methods thereof |
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| JP2000327409A (en) * | 1999-05-24 | 2000-11-28 | Nippon Soken Inc | Cordierite honeycomb structure and its production |
| EP1316538A1 (en) * | 2000-07-31 | 2003-06-04 | Ngk Insulators, Ltd. | Method for producing honeycomb structure |
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| JP2014510687A (en) * | 2010-11-08 | 2014-05-01 | ダウ グローバル テクノロジーズ エルエルシー | Composition for extruded bodies containing methylcellulose |
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