WO2004087294A1 - ハニカムフィルタ用基材及びその製造方法、並びにハニカムフィルタ - Google Patents
ハニカムフィルタ用基材及びその製造方法、並びにハニカムフィルタ Download PDFInfo
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- WO2004087294A1 WO2004087294A1 PCT/JP2004/001464 JP2004001464W WO2004087294A1 WO 2004087294 A1 WO2004087294 A1 WO 2004087294A1 JP 2004001464 W JP2004001464 W JP 2004001464W WO 2004087294 A1 WO2004087294 A1 WO 2004087294A1
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- honeycomb
- honeycomb filter
- base material
- substrate
- aggregate particles
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/2429—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the honeycomb walls or cells
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24492—Pore diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2498—The honeycomb filter being defined by mathematical relationships
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/06—Tubular membrane modules
- B01D63/066—Tubular membrane modules with a porous block having membrane coated passages
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2275/00—Filter media structures for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2275/30—Porosity of filtering material
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Definitions
- the present invention relates to a honeycomb filler substrate and a method for producing the same, and a honeycomb filler substrate.
- the present invention relates to a honeycomb filter, a substrate for a honeycomb filter, and a method for producing the same. More specifically, the present invention relates to a honeycomb filter having an excellent impurity removal performance and a large fluid permeation amount (that is, a processing ability), and a method for manufacturing such a honeycomb filter.
- the present invention relates to a base material for a honeycomb filter which can be suitably used for manufacturing a honeycomb filter, and a method for manufacturing the same.
- ceramic porous materials have been used to remove impurities such as suspended solids, bacteria, and dust mixed in fluids (liquids and gases). Is used.
- the filter has a plurality of cells 23 which are formed of a ceramic porous body having a large number of pores and are separated by partition walls and serve as fluid flow paths (hereinafter, referred to as a fluid flow path).
- a fluid flow path Such a shape is referred to as a “honeycomb shape”.
- a honeycomb filter as described above, when a fluid to be treated (fluid to be treated) is supplied into a plurality of cells, the fluid permeates through the ceramic porous material constituting the honeycomb filter from the inside of the cells, and the outer periphery thereof Suspended substances are removed when flowing out of the surface. Therefore, the purging of the 82-cam filter is built in the casing with the outer peripheral surface and the cell opening end surface liquid-tightly separated by a sealing material (such as a ring). The purified fluid (purified fluid) can be recovered.
- the honeycomb filter is made of a ceramic porous body having a large number of pores, and is divided by a partition, and has a base material having a plurality of cells serving as a fluid flow path, and a surface of the partition partitioning the plurality of cells.
- a structure including a formed filtration membrane made of a porous body having an average pore diameter smaller than that of the base material is employed (for example, Japanese Patent Application Laid-Open No. 2001-260117, And Japanese Patent Application Laid-Open No. 2001-340718).
- the average pore diameter of the filtration membrane by setting the average pore diameter of the filtration membrane to be smaller than the particle diameter of the impurities (about 0.01 to 1.0 mm), the performance of removing the impurities is secured,
- the average pore diameter of the material By making the average pore diameter of the material larger than that of the filtration membrane (about 1 to several 100 zm), the flow resistance when the fluid permeates the inside of the base material is reduced, and the amount of fluid permeation is increased and the treatment is performed. Capability can be improved. That is, in order to configure a honeycomb filter having a large fluid permeation amount and a high processing capacity, it is sufficient to configure the average pore diameter of the base material as large as possible.
- the filtration membrane when manufacturing a honeycomb filter, the filtration membrane is obtained by adhering a slurry containing aggregate particles to the surface of the partition wall of the base material (that is, the inner wall of the cell) to obtain a membrane, and the membrane is formed. Generally, it is formed by a method of drying and firing. When a filtration membrane having a small average pore diameter is to be formed, the membrane is formed using a slurry containing aggregate particles having a small average particle diameter.
- the present invention has been made in view of such problems of the related art, and has an advantageous effect of excellent impurity removing performance, a large fluid permeation rate, and a high processing ability. More specifically, the present invention provides a honeycomb filter base material and a method for manufacturing the same, which can be suitably used for manufacturing such a honeycomb filter.
- the present inventor has conducted intensive studies to solve the above-mentioned problems.
- the 50% pore diameter (d 5 ) of the ceramic porous body constituting the base material for the honeycomb filter was set to fall within the range of 8.5 to 13 m.
- the present invention was conceived to be able to solve the above-mentioned problems by controlling the average surface roughness of the partition walls for dividing a plurality of cells within the range of 3.0 to 5.5 m. Completed. That is, the present invention provides the following honeycomb filter base material, a method for manufacturing the same, and a honeycomb filter.
- a honeycomb fill substrate comprising a ceramic porous body having a large number of pores and divided by partition walls and having a plurality of cells serving as fluid flow paths, 50% pore diameter (d 5.) with in the range of 8. 5 ⁇ 1 3 (rn), the average surface roughness of partition walls for partitioning the plurality of cells 3. 0 ⁇ 5. 5 (m ).
- Honeycomb filter base material within the range of).
- 50% pore diameter (d 5 ) is the pore diameter measured by the mercury intrusion method, and the cumulative volume of mercury injected into the porous body is the total fineness of the porous body. (It means the pore diameter calculated from the pressure when the pore volume reaches 50% of the pore volume.)
- x% particle size (D x ) refers to the particle size of the powder measured by the sieving method, and uses a plurality of sieves having different nominal mesh sizes. (In the particle size distribution curve created from the relationship with the powder mass above, it means the particle size at the point where the integrated mass of the powder is X% of the total mass.)
- honeycomb filter substrate according to the above [1], and a ceramic porous material constituting the substrate, formed on a surface of a partition partitioning the plurality of cells of the honeycomb filter substrate.
- An intermediate membrane made of a porous body having a smaller 50% pore diameter (d 5 ) than the porous body, and a 50% pore diameter (50%) formed from a porous body formed on the surface of the intermediate membrane and constituting the intermediate membrane.
- honeycomb filter having a filtration membrane is made of a small porous body.
- FIG. 1 is a front view schematically showing one embodiment of a honeycomb fill substrate, showing a structure viewed from the cell opening end face side.
- FIG. 2 is a perspective view schematically showing one embodiment of an 82 cam film.
- the present inventor first forms an intermediate film made of a porous material having an average pore diameter between the substrate and the filtration membrane between the substrate and the filtration membrane.
- the cause that the total film thickness of the filtration membrane and the intermediate membrane becomes large and the flow resistance of the fluid in this part becomes large was examined.
- the intermediate film was conventionally formed thick.
- the surface of the intermediate film which is an underlayer of the filtration membrane, needs to be formed as smooth as possible to prevent occurrence of membrane defects in the filtration membrane.
- the 50% pore diameter (d 5 ) of the ceramic porous body constituting the honeycomb filler substrate is set to fall within a range of 8.5 to 13 m, and a plurality of pores are formed.
- the average surface roughness of the partition walls that separate the cells was controlled within the range of 3.0 to 5.5 m.
- the surface of the partition walls of the base material becomes relatively smooth and the irregularities are reduced, so that it is not necessary to fill the irregularities of the partition walls when forming the intermediate film. Its surface can be smoothed. Therefore, the total thickness of the filtration membrane and the intermediate membrane can be reduced while preventing the occurrence of defects in the filtration membrane, and the flow resistance of the fluid in this portion can be reduced. That is, the fluid permeation amount of the filter can be increased, and the processing capacity can be improved.
- the honeycomb filter substrate of the present invention is made of a ceramic porous body having a large number of pores, such as a honeycomb filter substrate 1 shown in FIG. It has a plurality of cells 3 serving as flow paths for the above.
- the shape of the 82-cam filter substrate (hereinafter sometimes simply referred to as “substrate”) is, as described above, as long as it has a honeycomb shape having a plurality of cells (through holes) serving as a fluid flow path.
- the overall shape include a cylindrical shape as shown in FIG. 1, a square pillar shape, a triangular pillar shape, and the like.
- the cell shape of the base material (cell shape in a cross section perpendicular to the cell formation direction) include, for example, a square, a circle, a hexagon, and a triangle as shown in FIG. Can be.
- the substrate is usually composed of ceramic. Compared to organic polymers, it has higher physical strength and durability, so it has higher reliability. This is due to the fact that even if the cleaning is performed, the deterioration is small, and the average pore diameter that determines the filtration ability can be precisely controlled.
- the type of the ceramic is not particularly limited, and examples thereof include cordierite, mullite, alumina, selven, aluminum titanate, lithium aluminum silicate, silicon carbide, silicon nitride, and mixtures thereof.
- the substrate is one in which a ceramic porous body having a large number of pores, in this onset Ming, 50% pore diameter (d 5.) Is that there in the range of 8.. 5 to 13 m is necessary. If the 50% pore diameter (d 5Q ) is less than the above range, the flow resistance when the fluid permeates the inside of the base material increases, the fluid permeation amount decreases, and the treatment capacity is unfavorably reduced. . On the other hand, if it exceeds the above range, it is not preferable in that the mechanical strength of the substrate decreases.
- the “50% pore diameter (d 5 )” in the present invention is a pore diameter measured by a mercury intrusion method, and the cumulative volume of mercury injected into the porous body is the same as that of the porous body. Means the pore diameter calculated from the pressure at which 50% of the total pore volume becomes.
- the mercury intrusion method is a pore size measuring method based on the following equation (4). Specifically, when mercury is injected into a dry porous body while gradually increasing the pressure, the diameter becomes large. Mercury is injected in order from the pores to increase the cumulative volume of mercury. When all pores are eventually filled with mercury, the cumulative volume reaches a balance (to the total pore volume of the porous body). Equivalent to) .
- the pore diameter d calculated from the pressure P when the accumulated capacity becomes 50% of the total pore volume of the porous body is defined as “50% pore diameter (d 5 )”.
- “50% pore diameter (d 5 )” is the so-called average pore diameter.
- the partition walls dividing the plurality of cells have an average surface roughness in a range of 3.0 to 5.5.
- the average surface roughness of the partition wall is less than the above range, the partition wall surface becomes unnecessarily smooth, and the intermediate film is easily peeled off from the partition wall surface when the intermediate film is formed on the partition wall surface.
- the surface of the partition wall is rough and the unevenness becomes large.
- the thickness of the intermediate film must be increased. That is, since the flow resistance of the fluid in the intermediate membrane portion increases, the amount of fluid permeation of the finally obtained honeycomb filter decreases, and the processing capacity decreases.
- “surface roughness” means surface roughness measured in accordance with JIS B 0601 “Surface roughness—definition and indication”. Specifically, a reference length is extracted from the roughness curve in the direction of the average line, and the surface roughness curve of the reference length is turned back on the basis of the average line, and the surface roughness curve is obtained by using the surface roughness curve and the average line. The value obtained by dividing the enclosed area by the reference length in micrometer (zm) was defined as surface roughness (R a).
- the “average surface roughness” refers to the surface roughness (R) at 10 arbitrarily selected locations among the surfaces of the partition walls that partition a plurality of cells of the honeycomb filler substrate. a) was measured and the measured values were averaged.
- the method for manufacturing a substrate for a honeycomb filter according to the present invention includes, at least, mixing and kneading aggregate particles and water to form a kneaded material, and dividing the kneaded material into a plurality of fluid passages which are separated by partition walls.
- the honeycomb molded body is obtained by forming into a honeycomb shape having the cells described above, followed by drying, and firing the honeycomb formed body to obtain a base material for a honeycomb filter.
- Aggregate particles are particles that are the main constituents of the base material (sintered body).
- the type of the aggregate particles is not particularly limited, and examples thereof include cordierite, mullite, alumina, cerbene, aluminum titanate, lithium aluminum silicate, silicon carbide, silicon nitride, and mixtures thereof.
- a kneaded material containing aggregate particles is formed into a desired honeycomb structure.
- the extrusion molding method is used using an extrusion die having a shape complementary to the cell shape, partition wall thickness, cell density, etc., the portion of the extrusion die that corresponds to the partition wall of the base material (the die) At the slit portion), it is not preferable in that the extruded honeycomb formed body often has defects and the yield of the honeycomb formed body is reduced.
- the 50% particle diameter (D 5 ) is determined by the difference between the partition wall thickness (W) of the 82-cam-fill base material. It is preferable that the following formula (3) be satisfied.
- the term “partition wall” in the present invention means all of the portions dividing a plurality of cells in the substrate, and is not limited to those having a constant thickness.
- the thickness of the part dividing the plurality of cells is not constant, but such a part is also included in the “partition wall” in the present invention.
- the definition of the above “partition wall thickness (W)” is problematic.
- the plurality of cells are divided. The thickness of the thinnest part of the
- a feature of the production method of the present invention is that, as the aggregate particles, those having a broader particle size distribution than conventional ones are dared to be used.
- Such aggregate particles include a relatively large number of particles having a small particle diameter, and can reduce the average surface roughness of the partition walls of the base material.
- the pore size distribution of the substrate becomes broader. Force The function of reliably removing impurities in the fluid by having a predetermined pore size Unlike filtration membranes, which need to ensure high performance, the substrate is not necessarily required to have a low flow resistance when the fluid passes through the inside of the substrate, a large amount of fluid permeation, and a high processing capacity. The pore size distribution need not be sharp.
- aggregate particles having a sharp particle size distribution for the purpose of sharpening the pore size distribution of the base material.
- aggregate particles between 50% particle size (D 5.), 25% particle size (D 25) and 75% particle size (D 75), the following equation (1) and the following Aggregate particles that satisfy the relationship of equation (2) are used.
- the ratio of the aggregate particles having a small particle diameter becomes too large, and the pore diameter of the manufactured base material may be reduced. That is, in the base material to be manufactured, the flow resistance when the fluid permeates the inside of the base material is increased, the amount of fluid permeation is reduced, and the processing capacity is not preferable.
- the relationship of the above formula (2) it is not preferable in that the yield of the honeycomb formed body may be reduced due to the clogging at the slit portion of the extrusion die.
- the “x% particle size (D x )” referred to in the present invention is a particle size of a powder measured by a sieving method, and a plurality of sieves having different nominal mesh sizes are used.
- the particle size distribution curve created from the relationship between the diameter and the mass of the powder on the sieve it means the particle size at the point where the integrated mass of the powder is x% of the total mass.
- a plurality of sieves with different nominal opening diameters are stacked in multiple stages so that the opening diameter increases in the upper stage, and the powder sample whose particle size is to be measured is placed on the uppermost stage.
- a commercially available ceramic raw material can be used as it is, or this can be pulverized.
- the method include a method of converting the aggregated particles into aggregate particles, and a method of appropriately mixing two or more kinds of such aggregate particles so as to satisfy the above-described conditions.
- the production method of the present invention can employ the same method as the conventionally known method for producing a honeycomb filter substrate, except that the above-described aggregate particles are used. First, at least the above-mentioned aggregate particles and water are mixed and kneaded to obtain a clay.
- the kneaded material may contain other additives, for example, an organic binder / dispersant, an inorganic binder, and the like, if necessary, in addition to the aggregate particles and water.
- additives for example, an organic binder / dispersant, an inorganic binder, and the like, if necessary, in addition to the aggregate particles and water.
- the organic binder is an additive that becomes a gel in a molded body (clay) before firing and functions as a reinforcing agent for maintaining the mechanical strength of the molded body.
- an organic polymer which can be gelled in a molded body (clay) for example, hydroxypropylmethylcellulose, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, polyvinyl alcohol, or the like is preferably used. Can be.
- the dispersant is an additive for promoting the dispersion of the aggregate particles in water as a dispersion medium.
- examples of the dispersant include ethylene glycol, dextrin, fatty acid test, polyalcohol, and the like.
- the inorganic binder is an additive for strengthening the bonding between the aggregate particles, and is made of a group consisting of alumina, silica, zirconia, titania, glass frit, feldspar, and collage having an average particle diameter of 10 m or less. At least one selected can be used.
- the inorganic binder is a particle made of ceramic, but is not included in the “aggregate particles” in the present invention.
- the inorganic binder it is preferable to add 10 to 35 parts by mass of the inorganic binder to 100 parts by mass of the aggregate particles. If the amount is less than 10 parts by mass, the strength of the base material is unfavorably reduced. If the amount is more than 35 parts by mass, the strength is improved, but the inorganic binder stops in the gap between the aggregate particles. This is not preferable in that the pores may be blocked and the amount of fluid permeation may be reduced.
- the above-mentioned aggregate particles, water, an organic binder, and the like can be prepared into a clay having an appropriate viscosity by, for example, mixing and kneading with a vacuum kneader.
- the knead The soil is formed into a honeycomb shape and dried to obtain a honeycomb formed body.
- a conventionally known molding method such as extrusion molding, injection molding, press molding, or the like can be used.
- the kneaded material prepared as described above is subjected to a desired honeycomb structure (cell shape, partition wall thickness). It is possible to suitably use a method of extrusion molding using an extrusion die having a shape complementary to that of the cell density.
- conventionally known drying methods such as hot-air drying, microwave drying, dielectric drying, reduced-pressure drying, vacuum drying, and freeze-drying can be used.
- the entire honeycomb formed body is quickly and uniformly dried. From the viewpoint that the drying can be performed, a drying method in which hot air drying and microphone mouth wave drying or dielectric drying are combined is preferable.
- Firing is an operation for sintering and densifying the aggregate particles in a molded body to secure a predetermined strength.
- firing conditions temperature and time
- appropriate conditions may be selected according to the type of aggregate particles used. For example, when silicon carbide is used as the aggregate particles, it is preferable to bake at a temperature of 130 to 230 ° C. for about 1 to 5 hours.
- the operation (calcination) of burning and removing (organic binder and the like) is preferable in that the removal of organic substances can be promoted.
- the combustion temperature of the organic binder is about 160 ° C.
- the calcination temperature may be set to about 200 to 100 ° C.
- the calcination time is not particularly limited, but is usually about 1 to 10 hours.
- the honeycomb filler according to the present invention is a ceramic porous body that constitutes the substrate, formed on the surface of the partition wall that divides the plurality of cells of the honeycomb filter substrate and the substrate for the honeycomb filter described above.
- a filtration membrane made of a small porous material Such a honeycomb filter prevents the occurrence of defects in the filtration membrane by the above-described special structure of the honeycomb filter base material in which the surface of the partition wall is relatively smooth and the unevenness is small. Therefore, it is not necessary to form the intermediate film thick. Therefore, it is possible to reduce the flow resistance of the fluid in the intermediate membrane portion, increase the fluid permeation amount of the filter, and improve the processing capacity.
- an intermediate film is formed on the surface of the partition wall of the honeycomb filter base material by using a conventionally known film forming method, and further, a filtration film is formed on the surface of the intermediate film.
- It can be manufactured by forming. For example, a film-forming slurry containing at least aggregate particles and water (and, if necessary, an organic binder, a pH adjuster, a surfactant, etc.) is adhered to the surface of the partition wall of the honeycomb filter substrate described above. Then, a film-forming body may be obtained, and the film-forming body may be dried and fired to form an intermediate membrane and a filtration membrane.
- the slurry for film formation may contain an inorganic binder for the same purpose as in the case of manufacturing the base material.
- an inorganic binder contained in the forming clay clay, kaolin, titania sol, silica sol, glass frit, etc. having an average particle diameter of 1 am or less can be used as the inorganic binder contained in the slurry for film formation. From the viewpoint of ensuring film strength, it is preferable to add 5 to 20 parts by mass to 100 parts by mass of the aggregate particles.
- the type of the film forming method is not particularly limited, and examples thereof include a dip film forming method and a filtration film forming method described in Japanese Patent Publication No. 63-66656.
- Aggregate particles, organic binders, and the like can be the same as those used in the production of the base material.
- substrate, intermediate layer it is necessary to reduce the order 50% pore diameter of the filtration membrane (d 5.), The 50% particle diameter of the aggregate particles (D 5.) Includes a substrate Generally, the size is reduced in the order of the intermediate membrane and the filtration membrane.
- honeycomb filter substrate of the present invention the method of manufacturing the same, and the honeycomb filter will be described in detail with reference to Examples, but the honeycomb filter substrate of the present invention, the method of manufacturing the same, and the honeycomb filter are described below.
- the present invention is not limited at all by the embodiments.
- a particle size distribution curve is created from the relationship between the particle size and the size of the sieve, and the particle size at the point where the integrated mass of the powder is 25% of the total mass is 25% particle size (D 25 ) and 50% particle size particle size of 50% (D 5.), and the particle diameter of the point at which 75% was defined as 75% particle diameter (D 75).
- the term “average particle diameter” simply means the above 50% particle diameter (D 5Q ).
- the clogging was caused in the slit portion of the extrusion die with respect to the total 100 manufactured honeycomb formed bodies. It was defined as the ratio (%) of the number of honeycomb formed bodies in which no defects occurred (that is, acceptable products).
- the molded product yield was evaluated as good when it exceeded 90%, slightly poor when it was 90% or less, and poor when it was 80% or less.
- the average surface roughness was calculated from the surface roughness (Ra) measured in accordance with JIS B0601 “Definition and Display of Surface Roughness”.
- a surface length curve is extracted from the roughness curve in the direction of the average line by a reference length, and the surface roughness curve of the reference length is folded back on the basis of the average line, and is surrounded by the surface roughness curve and the average line.
- the surface area (Ra) was defined as the value obtained by dividing the area obtained by the reference length in micrometer (m).
- the surface roughness (Ra) was measured at 10 randomly selected locations on the surface of the partition wall that divides the cells of the honeycomb filter substrate, and the average of the measured values was defined as the average surface roughness. did.
- the 50% pore size (cl 5 ) was measured by the mercury porosimetry.
- a sample of a predetermined shape is cut out from the honeycomb filter substrate or the honeycomb filter of the example or the comparative example, and mercury is injected into the sample while gradually increasing the pressure, and the press-in is performed.
- Cumulative volume of mercury that is, the following formula from the pressure P at the time of a 50% of the total pore volume of the sample (4) is calculated on the basis of the pore diameter d of 50% pore diameter (d 5.) Stipulated.
- the maximum pore size (d max ) of the filtration membrane was measured according to the air flow method described in ASTM F316.
- the honeycomb filter of Example or Comparative Example was moistened with water at a water temperature of 20 ° C, and pressurized air was sent from a plurality of cells of the honeycomb filter moistened with the water while gradually increasing the pressure.
- the pore diameter d calculated from the air pressure P when air bubbles were first confirmed from the outer peripheral surface of the cam filter based on the above equation (4) was defined as the maximum pore diameter (d max ).
- the maximum pore diameter (d MX ) is less than 1.8 xm, there is no membrane defect and the filter has excellent impurity removal performance. When it is 1.8 m or more, there is a membrane defect and the impurity It was evaluated as a fill which does not have sufficient removal performance.
- the average membrane thickness of the filtration membrane was calculated from the membrane thickness measured with a measuring microscope.
- the honeycomb filter of Example or Comparative Example was cut along a plane parallel to the end face of the cell opening, and the thickness of one row (44 cells) was measured along the diameter direction of the honeycomb filter, and the measured values were averaged. The defined value was defined as the average film thickness.
- the differential pressure was 4.8 to 9.8 kP a
- pure water is injected into a plurality of cells of the honeycomb filter, and then filtered by passing from the inside of the cell to the outer peripheral surface side of the honeycomb filter.
- the amount of water permeation was measured. If water permeability is 1. 67mVh r ⁇ m 2 or more, a large fluid permeation amount, the processing capability is high filter 1. When it is less than 67 m 3 / hr ⁇ ⁇ 2 is smaller in the fluid permeation amount, Insufficient processing capacity "evaluated.
- Example 3 // 10 00 1 ⁇ 1 1 no 10 1
- Example 4 Al 10 1 0 None 11,2 4.5
- Specific Example 7 Alumina 70 25 0.4 110 1.6 0.11- Yes 84
- Example 5 Alumina 70 30 0,4 101 1,4 0.11 None 98 12.1 5.0
- Example 6 Alumina 70 38 0.5 99 1.4 0.11 None 100 12.4 5.1
- Comparative Example 9 Alumina 75 30 0.4 105 1.4 0.12 None 98 14.2 5.8 Comparative Example 10 Alumina 75 30 0.4 105 1.4 0.12 None 100 14.2 5.8 Comparative Example 11 Alumina 75 36 0.5 97 1.3 0.12 None 98 14.6 5.9 Comparative Example 12 Alumina 75 36 0.5 97 1,3 0.12 None 100 14.6 5.9 Comparative Example 13 Alumina 85 32 0.4 112 L4 0.13 Yes 75
- the above-mentioned kneaded material is separated by partition walls by a conventionally known extrusion molding machine having an extrusion die having a shape complementary to a desired honeycomb structure (overall shape, cell shape, partition wall thickness).
- the honeycomb molded body was extruded into a honeycomb shape having a plurality of cells serving as roads, and dried with hot air at 100 at 48 hours to obtain a honeycomb formed body.
- This / two-piece molded body was fired in an electric furnace at 1300 ° C. for 2 hours to obtain a honeycomb filter substrate (hereinafter simply referred to as “substrate”).
- the overall shape of the substrate obtained as described above is an end face (cell opening face) having a circular shape with an outer diameter of 18 ⁇ and a cylindrical shape with a length of 100 Omm.
- the hexagon was 5 mm in diameter
- the partition wall thickness (W) was 650 m
- the total number of cells was 2000 cells.
- Table 1 shows the results of evaluating the 50% pore diameter (d 5 ) and the average surface roughness of the partition walls for these substrates.
- the 50% particle diameter of the aggregate particles as a raw material of the substrate (D 5.), D 2 5 / D 5. , D 75 for Example 1-7 was within the range of the manufacturing method of the present invention the D 50 is 50% pore diameter (d 5.) Is from 8.5 to 13 ⁇ 111, the average surface roughness of partition walls 3 It was possible to obtain a base material controlled to a thickness of from 0.5 to 5.5 m, showing good results. In addition, the yield of the honeycomb formed body exceeded 90%, and there was no problem at all.
- Comparative Examples 1 to 3 is less than the range of the manufacturing method of the 50% particle diameter (D 5 ") is the invention of the aggregate particles, 50% pore diameter of the resulting base material (d 50) is 8.5 It is anticipated that the flow resistance when the fluid permeates the inside of the base material will increase, that is, the fluid permeation amount of the finally obtained honeycomb filter will decrease, and the treatment capacity will decrease. Was expected.
- the 50% particle diameter (D 5.) Is the ratio Comparative Examples 8 to 14 that exceeds the range of the manufacturing method of the present invention of the aggregate particles, 50% pore diameter of the resulting base material (d 5.) 1 3 It was more than ⁇ , and it was expected that when forming an intermediate membrane or a filtration membrane, membrane defects such as membrane defects would increase. Among them, in Comparative Example 8, clogging occurred in the slit portion of the extrusion die during extrusion molding of the base material, so that many extruded honeycomb molded bodies were defective, and the yield of the honeycomb molded body was 90% or less. Has dropped. In addition, 50 % Value particle diameter (D 5 ") Z wall thickness (W) is the comparative example 13, 14 beyond the scope of the production method of the present invention, the yield of the honeycomb formed body is severely degraded 80% or less.
- the aggregate particles D 75 / D 5 Furthermore, the aggregate particles D 75 / D 5 .
- An intermediate membrane and a filtration membrane were formed on the above substrate by the following method to obtain a honeycomb filter.
- alumina particles with an average particle size of 3.2 are used as aggregate particles, glass frit with an average particle size of 0.9 m is used as an inorganic binder, methylcell mouth is used as an organic binder, and polycarboxylic acid is used as a dispersant. Salt was prepared.
- the aggregate particles, the inorganic binder, water, the organic binder, and the dispersant are mixed in a mass ratio of 100: 20: 400: 0.5: 2.0 to form a slurry for film formation (for an intermediate film).
- alumina particles having an average particle diameter of 0.4 / m were prepared as aggregate particles, methylcellulose was used as an organic binder, and polycarboxylate was used as a dispersant.
- the aggregate particles, water, an organic binder, and a dispersant were mixed at a mass ratio of 100: 1000: 4.0: 0.2 to prepare a slurry for membrane formation (for a filtration membrane).
- the slurry for film formation (for an intermediate film) is adhered to the surface of the partition wall of the base material by a filtration film formation method described in JP-B-63-66566 to obtain a film-formed body.
- the formed film was dried with hot air at 100 ° C. for 2 hours, and baked in an electric furnace at 1350 ° C. for 2 hours to form an intermediate film.
- the above-mentioned slurry for membrane formation (for filtration membrane) was applied to the surface of the intermediate membrane formed on the surface of the partition wall of the above substrate.
- a membrane was obtained by attaching the membrane, the membrane was dried with hot air at 100 ° C for 24 hours, and baked in an electric furnace at 1300 ° C for 2 hours to form a filtration membrane.
- filter simply referred to as “filter”.
- the intermediate membrane and the filtration membrane have the average values shown in Table 2. It had a film thickness and a 50% pore size (d 5 ). Table 2 shows the results of evaluating the is maximum pore diameter (d max ) and the water permeability of the filtration membrane for these filters.
- the filters of Comparative Examples 2 and 3 using a substrate having a 50% pore diameter (d 5Q ) less than the range of the present invention have a large flow resistance when a fluid permeates through the inside of the substrate.
- water permeability became 1. 67m 3 Zh r * m less than 2. That is, the fluid permeation amount decreased, and the treatment capacity decreased.
- the filters of Comparative Examples 9 to 12 using the base material having the average surface roughness of the partition walls exceeding the range of the present invention were used because the surface of the partition walls of the base material was rough and the unevenness was large.
- the intermediate film was formed thin, as in the case of the film, a membrane defect occurred in the filtration film. That is, the maximum pore diameter (d max ) of the filtration membrane was 1.8 m or more, and the performance of removing impurities was insufficient. In order to prevent such a situation, it is necessary to increase the thickness of the intermediate film as in the filters of Comparative Examples 10 and 12. Is big. That is, the filters of Comparative Examples 10 and 12 had a water permeability of less than 1.67 m 3 / r ⁇ m 2 , had a small fluid permeation amount, and had a low treatment capacity. Industrial applicability
- the honeycomb filter substrate of the present invention since the surface of the partition is relatively smooth and the unevenness is small, it is not necessary to fill the unevenness of the partition when forming the intermediate film. Even if it is thin, its surface can be made smooth. This means that the total thickness of the filtration membrane and the intermediate membrane can be reduced while preventing the occurrence of defects in the filtration membrane, and the flow resistance of the fluid in this portion can be reduced. . That is, the honeycomb filter substrate of the present invention is excellent in impurity removal performance, has a large fluid permeation amount, and can be suitably used for manufacturing a honeycomb filter having a high processing capacity.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Filtering Materials (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04710519A EP1609519A4 (en) | 2003-03-31 | 2004-02-12 | BASE FOR HONEYCOMB FILTER, METHOD OF MANUFACTURE AND HONEYCOMB FILTER |
US10/551,435 US20070026190A1 (en) | 2003-03-31 | 2004-02-12 | Base for honeycomb filter, method for producing same and honeycomb filter |
Applications Claiming Priority (2)
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JP2003094860A JP2004299966A (ja) | 2003-03-31 | 2003-03-31 | ハニカムフィルタ用基材及びその製造方法、並びにハニカムフィルタ |
JP2003-094860 | 2003-03-31 |
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WO2004087294A1 true WO2004087294A1 (ja) | 2004-10-14 |
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PCT/JP2004/001464 WO2004087294A1 (ja) | 2003-03-31 | 2004-02-12 | ハニカムフィルタ用基材及びその製造方法、並びにハニカムフィルタ |
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US (1) | US20070026190A1 (ja) |
EP (1) | EP1609519A4 (ja) |
JP (1) | JP2004299966A (ja) |
KR (1) | KR100707227B1 (ja) |
CN (1) | CN100438947C (ja) |
WO (1) | WO2004087294A1 (ja) |
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CN104475307A (zh) * | 2014-11-10 | 2015-04-01 | 华玉叶 | 一种机械法喷膜工艺 |
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WO2009032622A1 (en) * | 2007-09-04 | 2009-03-12 | Dow Global Technologies Inc. | Polymeric compositions and articles prepared therefrom |
WO2009073082A1 (en) * | 2007-11-29 | 2009-06-11 | Corning Incorporated | System and method for forming ceramic precursor material for thin-walled ceramic honeycomb structures |
JP5175777B2 (ja) * | 2009-03-04 | 2013-04-03 | 東京窯業株式会社 | ハニカム構造体 |
MY180523A (en) | 2011-03-22 | 2020-12-01 | Ngk Insulators Ltd | Porous body and honeycomb-shaped ceramic separation-membrane structure |
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JP5829840B2 (ja) * | 2011-06-17 | 2015-12-09 | 日本碍子株式会社 | 排ガス浄化フィルタ |
EP2832430B1 (en) * | 2012-03-30 | 2018-08-08 | NGK Insulators, Ltd. | Honeycomb shaped porous ceramic body, manufacturing method for same, and honeycomb shaped ceramic separation membrane structure |
MY174038A (en) * | 2012-03-30 | 2020-03-05 | Ngk Insulators Ltd | Honeycomb shaped porous ceramic body, manufacturing method for same, and honeycomb shaped ceramic separation membrane structure |
ES2466571B1 (es) * | 2014-03-12 | 2015-03-16 | Likuid Nanotek, S.L. | Membrana cerámica de filtración |
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FR3036626B1 (fr) * | 2015-05-29 | 2019-12-20 | Technologies Avancees Et Membranes Industrielles | Element de separation avec un reseau tridimensionnel de circulation pour le milieu fluide a traiter |
US20180112578A1 (en) * | 2016-10-24 | 2018-04-26 | Ngk Insulators, Ltd. | Porous material, honeycomb structure, and manufacturing method of porous material |
US10557393B2 (en) * | 2016-10-24 | 2020-02-11 | Ngk Insulators, Ltd. | Porous material, honeycomb structure, and method of producing porous material |
US11428138B2 (en) | 2016-10-24 | 2022-08-30 | Ngk Insulators, Ltd. | Porous material, honeycomb structure, and method of producing porous material |
US11365665B2 (en) | 2016-10-24 | 2022-06-21 | Ngk Insulators, Ltd. | Porous material, honeycomb structure, and method of producing porous material |
JP6788515B2 (ja) * | 2017-02-02 | 2020-11-25 | 日本碍子株式会社 | 目封止ハニカム構造体 |
JP2020081953A (ja) * | 2018-11-22 | 2020-06-04 | イビデン株式会社 | ハニカム構造体 |
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- 2004-02-12 KR KR20057018580A patent/KR100707227B1/ko not_active IP Right Cessation
- 2004-02-12 WO PCT/JP2004/001464 patent/WO2004087294A1/ja active Application Filing
- 2004-02-12 EP EP04710519A patent/EP1609519A4/en not_active Ceased
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CN104475307A (zh) * | 2014-11-10 | 2015-04-01 | 华玉叶 | 一种机械法喷膜工艺 |
CN104475307B (zh) * | 2014-11-10 | 2016-09-14 | 华玉叶 | 一种机械法喷膜工艺 |
Also Published As
Publication number | Publication date |
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EP1609519A1 (en) | 2005-12-28 |
EP1609519A4 (en) | 2007-10-17 |
KR20050123132A (ko) | 2005-12-29 |
KR100707227B1 (ko) | 2007-04-17 |
US20070026190A1 (en) | 2007-02-01 |
CN100438947C (zh) | 2008-12-03 |
CN1767884A (zh) | 2006-05-03 |
JP2004299966A (ja) | 2004-10-28 |
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