JP2008239421A - Body composition for ceramic extrusion molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a body composition having small shrinkage by drying, less cracks by drying and preferable forming property for manufacturing a formed body for ceramic molding. <P>SOLUTION: The body composition for extrusion molding contains ceramic particles, water and a fatty acid amine salt (A). The fatty acid amine salt (A) comprises a salt of an 8-18C fatty acid and an amine. The body composition preferably contains water by 2 to 20 parts by weight and the fatty acid amine salt (A) by 0.5 to 15 parts by weight with respect to 100 parts by weight of the ceramic particles. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a clay composition used for producing a molded body for ceramic extrusion mainly comprising ceramic particles.

In recent years, honeycomb-structured ceramic extrusion molded products have been used in exhaust gas purification apparatuses such as diesel engines. For these exhaust gas purifying apparatuses, it is required to make the honeycomb partition walls thinner than before for the purpose of improving the catalyst efficiency. However, when the wall of the ceramic extruded product is further reduced, a problem is likely to occur in the formability during extrusion molding. As countermeasures for this, the clay composition was mixed with fatty acid metal soap (Patent Document 1), polyoxyalkylene glycol (Patent Document 2), fatty acid ester (Patent Document 3), methyl polyoxyethylene (average degree of polymerization 10.8). Improvement of moldability by adding a copolymer of monoallyl ether and maleic anhydride (Patent Document 4), wax emulsion (Patent Document 5), etc. has been proposed. And the clay composition which added these dispersing agents has improved the moldability at the time of an extrusion molding process conventionally.

Japanese Patent Laid-Open No. 02-81606 Japanese Patent Laid-Open No. 06-92715 Japanese Patent Application Laid-Open No. 07-138076 Japanese Patent Application Laid-Open No. 07-25665 JP 2001-179720 A

However, the clay composition comprising the above additives can improve the moldability during the extrusion process, but the ratio of water in the clay composition remains the same as before, so The problem of drying shrinkage in the drying process cannot be solved. Usually, the higher the proportion of water in the clay composition, the greater the shape distortion due to drying shrinkage, resulting in lower dimensional accuracy and yield of the product. As a countermeasure, reduction of the ratio of water in the clay composition is required. The present invention not only improves the formability in the extrusion molding process, but also produces a molded body for ceramic extrusion molding that can reduce the ratio of water in the clay composition and reduce drying shrinkage. An object of the present invention is to provide a clay composition used for the purpose.

As a result of intensive studies to solve the above problems, the present inventor has reached the present invention. That is, this invention is a clay composition for extrusion molding characterized by containing ceramic particle | grains, water, and a fatty-acid amine salt (A).

The extrusion molding clay composition of the present invention is excellent in moldability at the time of extrusion even with a low ratio of water in the clay composition, so that a good ceramic molded body with small drying shrinkage and few dry cracks can be obtained. Can do.

The ceramic particles contained in the clay composition of the present invention include dielectric ceramic materials represented by alumina, titanium oxide and barium titanate; piezoelectric ceramic materials such as lead zirconate titanate; and components such as kaolin and talc. Examples thereof include oxide ceramic materials such as cordierite materials; silicon nitride; silicon carbide; and alumina nitride.

The average particle size of the ceramic is usually 0.1 to 100 μm, preferably 0.3 to 50 μm. The average particle size can be measured with a laser diffraction / scattering particle size distribution measuring apparatus.

Examples of the water contained in the clay composition of the present invention include tap water, industrial water, ground water, distilled water, ion exchange water, and ultrapure water. .

As a fatty acid which comprises the fatty-acid amine salt (A) contained in the clay composition of this invention, a C6-C24 fatty acid is mentioned, for example. Specifically, caproic acid, heptanoic acid, caprylic acid, pelargonic acid, capric acid, citronellic acid, undecyl acid, undecylenic acid, lauric acid, Linderic acid, tridecylic acid, myristic acid, perfume acid, pentadecylic acid, zomerphosphoric acid , Palmitic acid, palmitoleic acid, margaric acid, stearic acid, oleic acid, linoleic acid, nonadecylic acid, arachidic acid, gadoleic acid, behenic acid, lignoceric acid, serotic acid, montanic acid, and melicic acid. Of these, fatty acids having 8 to 18 carbon atoms are preferable from the viewpoint of extrudability when water is in a low ratio, and caprylic acid, capric acid, lauric acid and oleic acid are more preferable, Preference is given to capric acid and oleic acid.

Examples of amines constituting the fatty acid amine salt (A) include alkylamines [mono, di, tri, alkyl (1 to 18 carbon atoms) amines (methylamine, dimethylamine, triethylamine, propylamine, hexylamine, nonylamine, dodecyl]. Amines, pentylamine and stearylamine, etc.)] and alkanolamines (monoethanolamine, monoethylaminoethanol, dimethylaminoethanol, diethylaminoethanol, diethylaminopropanol, diethanolamine, methyldiethanolamine, triethanolamine, propanolamine, isopropanolamine and cyclohexylethanol) Amine). Of these, alkanolamines are preferred from the viewpoint of extrudability when water is used at a low ratio, and monoethanolamine, diethanolamine and triethanolamine are particularly preferred.

The fatty acid amine salt (A) can be obtained by mixing and neutralizing the fatty acid and amine. The charge equivalent ratio of fatty acid and amine (fatty acid / amine) is usually (0.9 / 1.1) to (1.1 to 0.9), preferably (1.0 / 1.0) to (1. 0 / 1.1). It is preferable from the viewpoint of water solubility of the clay composition that the amine is excessive and remains in the clay composition, rather than the fatty acid excessively remaining in the clay composition.

The clay composition of the present invention may further contain one or more components selected from the group consisting of the following vinyl polymer (B), polyalkylene polyol (C) and cellulose derivative (D), if necessary. Good.

By containing the vinyl polymer (B), a more excellent extrudable clay composition can be obtained. The vinyl polymer (B) has (meth) acrylic acid (salt) (m1) and the vinyl monomer (m2) represented by the general formula (1) as essential constituent monomers.
^{_{CH 2 = CR 1 -COO- (AO}} ) p -X (1)
In the formula, R ¹ represents a hydrogen atom or a methyl group, AO represents an oxyalkylene group having 2 to 4 carbon atoms, X represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, p represents an average addition mole number of AO, and 0 Represents a number exceeding 200 and not more than 200. In the present invention, "(meth) acryl ..." means "acryl ..." and / or "methacryl ...". "... acid (salt)" means "... acid" and / or "... acid salt".

As the salt in (meth) acrylic acid (salt) (m1), alkali metal salt, alkaline earth metal salt, ammonium salt, organic amine salt (monoethanolamine salt, diethanolamine salt, monoethylaminoethanol salt, dimethylaminoethanol) Salt, diethylaminoethanol salt, triethanolamine salt, etc.). These may be a mixture of two or more.

Of the (meth) acrylic acid (salt), from the viewpoint of extrusion moldability, (meth) acrylic acid, (meth) acrylic acid sodium salt, (meth) acrylic acid ammonium salt, and (meth) acrylic acid organic amine salt More preferred are methacrylic acid, ammonium methacrylate salt, and organic amine salt of methacrylic acid.

In the general formula (1) representing the vinyl monomer (m2), R ¹ is preferably a methyl group. Examples of the oxyalkylene group having 2 to 4 carbon atoms (AO) include an oxyethylene group, an oxypropylene group, an oxybutylene group, and combinations of two or more thereof. Of these, oxyethylene groups, oxypropylene groups, and combinations thereof are preferable from the viewpoint of extrusion moldability and the like. When two or more types are used in combination, this bonding form may be any of a block form, a random form, and a mixture thereof. p is usually a number exceeding 0 and not more than 200, and is preferably 9 to 190, more preferably 21 to 150, and particularly preferably 30 to 100 from the viewpoint of extrusion moldability and the like.

X represents an alkyl group having 1 to 12 carbon atoms, such as a linear alkyl group {methyl, ethyl, n-butyl, n-hexyl, n-octyl, n-decyl, n-undecyl, n-dodecyl, etc.} and Branched alkyl {isopropyl, t-butyl, 2-ethylhexyl, isodecyl, isododecyl and the like}. Of these, a linear alkyl group is preferable, and methyl, ethyl, n-butyl, n-hexyl and n-octyl are more preferable.

Examples of the vinyl monomer (m2) include alkyl polyoxyalkylene (meth) acrylate and polyoxyalkylene glycol mono (meth) acrylate. Of these, alkylpolyoxyalkylene (meth) acrylate is preferable from the viewpoint of extrusion moldability and the like, more preferably alkylpolyoxyalkylene (2 to 3 carbon atoms) (meth) acrylate, and still more preferably alkyl (carbon). 1-6) polyoxyalkylene (2-3 carbon atoms) (meth) acrylate, particularly preferably alkyl (1-6 carbons) polyoxyethylene (meth) acrylate, most preferably alkyl (1-6 carbon atoms) ) Polyoxyethylene methacrylate.

The vinyl monomer (m2) can be produced by a known method (Japanese Patent Laid-Open No. 2005-289844) or the like, but a commercially available product may be used. Commercially available products include Blemmer (registered trademark) PME series {PME-1000 (methyl polyoxyethylene methacrylate: in formula (1), AO = oxyethylene, p = 23, X = methyl) and PME- 4000 (methyl polyoxyethylene methacrylate: general formula (1), AO = oxyethylene, p = 90, X = methyl, etc.)} and Kyoeisha Chemical Co., Ltd. light ester 041MA (methyl polyoxyethylene methacrylate: formula (1) , AO = oxyethylene, p = 30, X = methyl) and the like.

The content (mol%) of the (meth) acrylic acid (salt) (m1) unit constituting the vinyl polymer (B) is, from the viewpoint of extrusion moldability, the (meth) acrylic acid (salt) (m1) unit and Based on the total number of moles of vinyl monomer (m2) units, it is preferably 72 to 98 mol%, more preferably 80 to 97 mol%, particularly preferably 82 to 96 mol%, particularly preferably 84 to 95 mol%. .

The content (mol%) of the vinyl monomer (m2) unit is based on the total number of moles of the (meth) acrylic acid (salt) (m1) unit and the vinyl monomer (m2) unit from the viewpoint of extrusion moldability and the like. It is preferably 2 to 28 mol%, more preferably 3 to 20 mol%, particularly preferably 4 to 18 mol%, and particularly preferably 5 to 16 mol%.

In addition to (meth) acrylic acid (salt) (m1) and vinyl monomer (m2), the vinyl polymer (B) may contain other vinyl monomers as constituent monomers. Other vinyl monomers are not particularly limited as long as they can be copolymerized with (meth) acrylic acid (salt) (m1) and vinyl monomer (m2), but are known monomers (Japanese Patent Laid-Open No. 2005-154266). Etc.) can be used. Among these, preferred are (meth) acrylamide and cationic (meth) acrylic ester from the viewpoint of extrusion moldability.

When other vinyl monomers are used as constituent monomers, the content (mol%) of the units of other vinyl monomers is the (meth) acrylic acid (salt) (m1) unit and vinyl from the viewpoint of extrusion moldability and the like. Based on the total number of moles of monomer (m2) units, it is preferably 28 mol% or less, more preferably 0.2 to 17 mol%, particularly preferably 0.3 to 14 mol%, and particularly preferably 0.4 to 11. Mol%.

The weight average molecular weight (Mw) of the vinyl polymer (B) is preferably 10,000 to 1,800,000, more preferably 50,000 to 1,000,000, particularly preferably from the viewpoint of extrusion moldability and the like. 100,000 to 300,000. The weight average molecular weight is measured by gel permeation chromatography (GPC) method (standard substance: polyethylene glycol).

The vinyl polymer (B) can be easily obtained by a known polymerization method {solution polymerization, suspension polymerization, bulk polymerization, reverse phase suspension polymerization, emulsion polymerization or the like}. Of the known polymerization methods, solution polymerization, suspension polymerization, reverse phase suspension polymerization and emulsion polymerization are preferred, more preferably solution polymerization, reverse phase suspension polymerization and emulsion polymerization, particularly preferably solution polymerization and emulsion polymerization. Solution polymerization is preferred. For the polymerization, known polymerization initiators, chain transfer agents, and / or solvents can be used. When using a solvent, you may use the solution (suspension or emulsion) of the obtained vinyl polymer (B) as it is. On the other hand, the solvent may be distilled off from the solution, suspension or emulsion, and the solvent may be used by substituting with another solvent (for example, water).

In the case where the vinyl polymer (B) is a salt, the vinyl polymer (B) may be produced using (meth) acrylate, or after the vinyl polymer is obtained using (meth) acrylic acid, an alkali is obtained. It is good also as a salt by mixing with (for example, Unexamined-Japanese-Patent No. 2001-152199). Of these methods, the latter is preferred.

When the clay composition of the present invention contains the polyalkylene polyol (C), a clay composition having even better extrudability can be obtained.

As a polyalkylene polyol (C), the polyalkylene polyol which added the C2-C6 alkylene oxide to water or 1-6 valent alcohol is mentioned.

From the viewpoint of the viscosity of the clay composition, the polyalkylene polyol (C) preferably has a number average molecular weight (measured by gel permeation chromatography; hereinafter abbreviated as Mn) of 60 to 30,000, More preferably, it is 100-20,000.

As the polyalkylene polyol (C), polyethylene glycol having a number average molecular weight (Mn) of 106 to 6,000 (diethylene glycol, triethylene glycol, polyethylene glycol having Mn of 194 to 6,000); Mn of 134 to 4,000 Polypropylene glycol (di-1,2-propylene glycol, polypropylene glycol having an Mn of 192 to 4,000); a copolymer of polyethylene oxide / polypropylene oxide random, block, or a combination thereof; tetrahydrofuran and a carbon number of 2 to 4 And polyalkylene polyols composed of 1,2 alkylene oxide; and polyalkylene polyols described in JP-A-7-69711 and JP-A-11-58335. Among the polyalkylene polyols, from the viewpoint of extrudability, preferred are diethylene glycol, triethylene glycol, polyethylene glycol, a polyethylene oxide / polypropylene oxide copolymer, a polyalkylene polyol composed of a tetrahydrofuran / ethylene oxide copolymer, and these. It is a combined use.

The clay composition of the present invention contains one or more cellulose derivatives (D) selected from the group consisting of alkyl cellulose, hydroxyalkyl cellulose and hydroxyalkylalkyl cellulose, so that these cellulose derivatives function as a binder. And better shape retention.

Examples of the alkyl cellulose include methyl cellulose and the like; examples of the hydroxyalkyl cellulose include hydroxyethyl cellulose; and examples of the hydroxyalkyl alkyl cellulose include hydroxypropyl methyl cellulose and hydroxyethyl ethyl cellulose.

In the clay composition of the present invention, water is preferably 2 to 20 parts by weight, more preferably 5 to 15 parts by weight (100 parts by weight unless otherwise specified) with respect to 100 parts by weight of ceramic particles. Containing). If the amount of water is 2 parts or more, the extrudability can be further improved, and if the amount is 20 parts or less, the drying shrinkage is likely to be further reduced.

The clay composition of the present invention preferably contains 0.5 to 15 parts, more preferably 1 to 10 parts of the fatty acid amine salt (A) with respect to 100 parts by weight of the ceramic particles. If the fatty acid amine salt (A) is 0.5 part or more, the extrusion moldability can be further improved, and even if 15 parts or more is added, the extrusion moldability is not improved.

The kneaded clay composition of the present invention, each content when containing one or more selected from the group consisting of the vinyl polymer (B), the polyalkylene polyol (C) and the cellulose derivative (D), From the viewpoint of extrusion moldability, the amount is preferably 10 parts or less, more preferably 1 to 8 parts, relative to 100 parts of ceramic particles.

The clay composition of the present invention comprises a fatty acid amine salt (A) when it contains one or more selected from the group consisting of the vinyl polymer (B), the polyalkylene polyol (C), and the cellulose derivative (D). ) And the ratio of each component are preferably (1/10) to (10/1), more preferably (1/8) to (8/1), particularly from the viewpoint of extrusion moldability. Preferably they are (1/5)-(5/1).

The clay composition of the present invention may further contain a known dispersing agent and solvent (JP 2004-203705 A, JP 2002-37673 A, etc.) as necessary. When a known dispersant is contained, the content may be appropriately selected from the viewpoint of ease of handling, but the ratio with the content of the fatty acid amine salt (A) is (1 from the viewpoint of extrusion moldability. / 10) to (10/1) are preferable. When a known solvent is contained, this content may be appropriately selected from the viewpoint of ease of handling, but the ratio with the content of the fatty acid amine salt (A) is (1/20) to (5/1). Is preferred.

The kneaded clay composition of the present invention is suitable as a kneaded clay composition used for producing a ceramic molded body by extruding and molding the kneaded clay composition.

As a method for producing a ceramic molded body using the clay composition of the present invention, a known method (JP 2002-37673 A) or the like can be applied, and the clay composition of the present invention is extruded. It is preferable to include a step of obtaining an extruded product and a step of firing the extruded product to obtain a fired product. In addition, the step of obtaining the fired body includes a cooling operation after firing, and may further include a step of machining the fired body to obtain a ceramic molded body if necessary. {If this step is not included, the fired body remains as it is. It becomes a ceramic molded body. }.

Examples Hereinafter, the present invention will be further described with reference to Examples and Production Examples, but the present invention is not limited thereto. In the following, “parts” and “%” respectively represent “parts by weight” and “% by weight” unless otherwise specified.

<Production Example 1>
After charging 53 parts of capric acid into a glass reaction vessel, 47 parts of triethanolamine was gradually added at 60 ° C. with stirring to obtain capric acid triethanolamine salt (a-1).

<Production Example 2>
In the same manner as in Production Example 1, except that “53 parts of capric acid” was changed to “72 parts of oleic acid” and “47 parts of triethanolamine” was changed to “28 parts of diethanolamine” (diethanolamine salt of oleic acid ( a-2) was obtained.

<Production Example 3>
A SUS autoclave equipped with a thermometer and a stirrer was charged with 102 parts of hexanol and 4 parts of sodium hydroxide, and after the inside of the container was sufficiently purged with nitrogen, 3960 parts of ethylene oxide was blown in at 180 ° C. for 5 hours. Further, after aging at 180 ° C. for 1 hour, the mixture was cooled to 25 ° C. Transfer the contents to a glass reactor equipped with a thermometer, stirrer, product water separator, reflux condenser, and charge 12 parts hydroquinone monomethyl ether, 50 parts hypophosphorous acid, 50 parts sulfuric acid, and 860 parts methacrylic acid. The temperature was raised to 120 ° C. At this temperature, a small amount of air is introduced into the liquid phase, and the generated water is removed by reducing the gas phase at 60 kPa, so that hexyl polyoxyethylene (addition mole number 90 mol) methacrylate [10 mol% {“mol%”] Means the concentration based on the total number of moles of (meth) acrylic acid (salt) (A) and vinyl monomer (B), and so on. }] And a mixed monomer (1) of methacrylic acid [90 mol%] were obtained. Next, 250 parts of water and 100 parts of isopropyl alcohol were charged in a reaction vessel and purged with nitrogen. Then, the temperature was raised to 80 ° C. and refluxed at 80 ° C. with stirring (recirculation continued until completion of aging). ) And 50 parts of a sodium persulfate 3% aqueous solution were added dropwise over 3 hours and reacted. Subsequently, after aging at 80 ° C. for 2 hours, a portion of sopropyl alcohol and water was distilled off at 80 to 100 ° C. Thereafter, the mixture was cooled to 40 ° C., neutralized by adding 75 parts of triethanolamine over 10 minutes at 40 ° C., and then cooled to 25 ° C. After measuring the concentration by the following method (hereinafter the same), water was added at 25 ° C. to obtain a copolymer aqueous solution (b-1) having a concentration of 35% by weight. The weight average molecular weight of the copolymer {by the following method (hereinafter the same)} was 150,000.

<Measurement method of concentration>
About 2 g of the aqueous copolymer solution was weighed and collected in a glass petri dish. The glass petri dish was heated with a circulating dryer at 130 ° C. for 1 hour, then removed from the circulating dryer and placed in a desiccator, and cooled to 25 ° C. The residue remaining on the glass petri dish was weighed, and the concentration of the aqueous copolymer solution was calculated according to the following formula.

<Weight average molecular weight>
Measuring instrument: Waters GPC system [pump; Model 510,
Detector; waters 410]
Eluent: Type Water / methanol (70/30 (volume ratio)) + sodium acetate {5 g / liter (vs water / methanol)}
Flow rate 1.0 (ml / min)
Column: TSKgel G3000PWXL + TSKGel G50000PWXL
7.8 ml I.V. D x 30cm
Column temperature: 40 ° C
Standard substance: polyethylene glycol {weight average molecular weight: 2.4 × 10 ⁴ , 5.0 × 10 ⁴ , 1.07 × 10 ⁵ , 2.5 × 10 ⁵ , 5.4 × 10 ⁵ , 9.0 × 10 ⁵ (Tosoh Corporation TSK standard polyethylene oxide SE-2, SE-5, SE-8, SE-30, SE-70, SE-150)}

Other blends used in Examples and Comparative Examples are as follows.
(C-1); diethylene glycol (manufactured by Nacalai Tesque Co., Ltd., reagent grade 1)
(D-1); methylcellulose ("Metroise 90SH-3000", manufactured by Shin-Etsu Chemical Co., Ltd.)
(E-1); sodium oleate (reagent grade 1 manufactured by Nacalai Tesque)
(E-2); ammonium stearate (manufactured by Nacalai Tesque, Inc., reagent grade 1

<Example 1>
10 parts of water and 6 parts of (a-1) were added to 100 parts of low soda alumina LS-20 (manufactured by Nippon Light Metal Co., Ltd.), and further kneaded to obtain a clay composition. This kneaded material composition was packed into a 12 mmφ piston with a 7.5 mmφ cap attached to the tube tip, and a piston was extruded at an extrusion speed of 6 mm / s to obtain a molded body. At this time, the load applied to the piston was measured, and the maximum value is shown in Table 1. The hardness (by the following method) of the clay composition was measured and shown in Table 2. Further, the appearance of the molded body during extrusion molding was visually evaluated, and the results are shown in Table 2. Further, the obtained extruded product was cut into a length of 50 mm, heated for 5 hours in an electric furnace at 450 ° C., and then the surface state (appearance) of the molded product cooled to room temperature (about 25 ° C.) was observed and observed. The results are shown in Table 2.

<Hardness of clay composition>
After the extrusion test, the clay remaining in the piston was taken out, and the hardness was measured using an NGK hardness tester (manufactured by NGK) with the measuring probe perpendicular to the surface. It measured 10 times about different places with said method, and made this arithmetic average value the hardness of a clay composition.

<Examples 2-5 and Comparative Examples 1-3>
The components of the components shown in Table 1 were blended, and the clay compositions of Examples 2 to 5 and Comparative Examples 1 to 3 were obtained in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The results are shown in Table 2.

(Note) Appearance during extrusion molding ○: The surface of the molded product is smooth
×: Sacrifice is generated on the surface of the molded body Appearance after heating at 450 ° C ○: The surface of the molded body is smooth
×: Sacrifice and cracks occur on the surface

As shown in Table 2, the clay composition (Examples 1 to 5) of the present invention had a better appearance of the molded product than Comparative Examples 1 to 3. Moreover, since the load at the time of extrusion is small, it is guessed that the extrudability is good because the adhesiveness of the composition containing ceramic or the like is lowered and the slip in the die is improved.

The kneaded clay composition of the present invention is suitable as a kneaded clay composition used for producing a ceramic molded body by extruding and molding the kneaded clay composition.

Claims (6)

A clay composition for ceramic extrusion, comprising ceramic particles, water and a fatty acid amine salt (A). The clay composition for extrusion molding according to claim 1, wherein the fatty acid amine salt (A) is a salt comprising a fatty acid having 8 to 18 carbon atoms and an amine. The clay composition for extrusion molding according to claim 1 or 2, comprising 2 to 20 parts by weight of water and 0.5 to 15 parts by weight of the fatty acid amine salt (A) with respect to 100 parts by weight of the ceramic particles. The vinyl polymer (B) containing (meth) acrylic acid (salt) (m1) and the vinyl monomer (m2) represented by the general formula (1) as an essential constituent monomer is further contained. The clay composition for extrusion molding according to any one of -3.
^{_{CH 2 = CR 1 -COO- (AO}} ) p -X (1)
{In the formula, R ¹ represents a hydrogen atom or a methyl group, AO represents an oxyalkylene group having 2 to 4 carbon atoms, X represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms, and p represents an average addition mole number of AO. A number greater than 0 and less than or equal to 200 is represented. } Furthermore, the polyalkylene polyol (C) is contained, The clay composition for extrusion molding in any one of Claims 1-4 characterized by the above-mentioned. Furthermore, the clay composition for extrusion molding in any one of Claims 1-5 containing 1 or more types of cellulose derivatives (D) chosen from the group which consists of alkyl cellulose, hydroxyalkyl cellulose, and hydroxyalkyl alkyl cellulose.