WO2005018893A1 - ハニカム成形体の製造方法、ハニカムフィルタの製造方法、及びハニカムフィルタ - Google Patents
ハニカム成形体の製造方法、ハニカムフィルタの製造方法、及びハニカムフィルタ Download PDFInfo
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- WO2005018893A1 WO2005018893A1 PCT/JP2004/011759 JP2004011759W WO2005018893A1 WO 2005018893 A1 WO2005018893 A1 WO 2005018893A1 JP 2004011759 W JP2004011759 W JP 2004011759W WO 2005018893 A1 WO2005018893 A1 WO 2005018893A1
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- honeycomb
- honeycomb formed
- formed body
- mixing
- manufacturing
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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
- B01D46/24—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
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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
-
- 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
- B01D46/0039—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices
- B01D46/0047—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for discharging the filtered gas
- B01D46/0049—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with flow guiding by feed or discharge devices for discharging the filtered gas containing fixed gas displacement elements or cores
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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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 method for manufacturing a honeycomb formed body, a method for manufacturing a honeycomb filter, and a honeycomb.
- the present invention relates to, for example, a method for manufacturing a honeycomb formed body, a method for manufacturing a honeycomb filter, and a honeycomb filter suitably used for manufacturing a filter for dust collection and water treatment.
- a method for manufacturing a honeycomb formed body and a method for manufacturing a honeycomb filter capable of effectively preventing the occurrence of internal defects such as holes, cuts, and swelling, and improving the strength, and a honeycomb filter excellent in filtration performance (collection efficiency).
- a porous honeycomb structure made of ceramics having excellent heat resistance, corrosion resistance, and mechanical strength is used for the filter.
- filters made of porous ceramics are used for dust collection filters used in high-temperature, corrosive gas atmospheres, such as diesel particulate filters (DPFs) that collect particulates (soot) discharged from diesel engines.
- DPFs diesel particulate filters
- Examples of filters using a porous honeycomb structure include a large number of porous honeycomb structures 25, such as a honeycomb filter 21 shown in Fig. 1.
- the cell 23 has a structure in which the inlet-side end face B and the outlet-side end face C are alternately plugged by the plugging portion 22.
- the honeycomb filter 21 having such a structure, when the gas G to be treated is introduced into the cell 23 from the inlet end face B, contamination such as particulates is caused.
- the above-mentioned porous honeycomb structure is obtained by, for example, obtaining a molding compound (wet powder) by mixing a raw material containing aggregate particles such as ceramics and water with a raw material.
- Combination A kneaded material is obtained by kneading a material (wet powder), the kneaded material is formed into a honeycomb shape, and a honeycomb formed body is obtained by drying, and the honeycomb formed body is fired.
- the porous honeycomb structure obtained by a simple manufacturing method has internal defects such as small holes, cuts, burrs, etc., and the filtering performance (collection efficiency) of the filter using this is not necessarily sufficient. I could't help but say something.
- the partition walls have been rapidly made thinner for the purpose of reducing the pressure loss when gas permeates the partition walls and improving the processing capacity of the filter.
- Such a porous honeycomb structure having thin partition walls is liable to cause internal defects such as small holes, cuts, and splinters during the manufacturing process, so that the filter performance (collection efficiency) due to these internal defects is high. ) Is becoming a very serious problem.
- a porous honeycomb structure is required to have high strength. This is because the transmission performance of the filter using the porous honeycomb structure can be improved by increasing the strength. Since porosity is generally considered to be proportional to the permeation performance, there is a case where an attempt is made to increase the porosity of the porous honeycomb structure as a means for reducing the pressure loss and improving the processing capacity of the filter. However, since increasing the porosity causes a decrease in strength, it has been difficult to apply the filter as a dust collection filter for the DPF or the like.
- the present inventor has slurried the aggregate particle material once, passed through a sieve having a predetermined opening to remove coarse agglomerates, and then powdered again.
- a method for manufacturing a honeycomb ceramic structure in which powder is used for preparing a forming raw material has been proposed (for example, see WO 01/058827 pamphlet (Patent Document)).
- the manufacturing method as described above removes coarse agglomerates and forms a porous honeycomb. Although it is a very effective method from the viewpoint of preventing internal defects of the structure and improving the strength, the process becomes complicated due to the necessity of slurrying the raw material of aggregate particles, and the work becomes complicated. However, there was a problem that it became complicated.
- the present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to easily remove internal defects without increasing the number of steps and complicating work.
- the present inventor has conducted intensive studies to solve the above-described problems. As a result, in a process of mixing and kneading a forming raw material containing an aggregate particle raw material and water, a kneaded material is obtained. Achieved the above objective by taking measures to prevent at least coarse aggregates from agglomerates formed by agglomeration of fine particles of the aggregate particle material contained in the clay.
- the inventors have found that the present invention can be performed and completed the present invention. That is, the present invention provides the following method for manufacturing a formed honeycomb article, a method for manufacturing a honeycomb filter, and a honeycomb filter.
- a method for producing a honeycomb formed body using a forming raw material containing two or more kinds of aggregate particle raw materials containing fine particles having an average particle diameter of 10 ⁇ or less and water, and a honeycomb formed body Then, a mixing step of obtaining a molding compound (dry powder) by mixing two or more types of aggregate particle raw materials (first mixing), and adding water to the molding compound (dry powder).
- a method for manufacturing a honeycomb formed body to obtain a honeycomb formed body also referred to as a first method for manufacturing a honeycomb formed body).
- a method for producing a honeycomb formed body using a forming raw material containing two or more types of aggregate particle raw materials including fine particles having an average particle diameter of 10 ⁇ m or less and water, and a honeycomb formed body After mixing two or more types of aggregate particle raw materials (first mixing) to obtain a molding compound (dry powder), water is further added and mixed (second mixing). And a kneading step of kneading the molding compound (wet powder) to obtain a kneaded clay by kneading the molding compound (wet powder). Many cells are divided by A method for producing a honeycomb formed body, which is obtained by forming into a formed honeycomb shape and drying the same to form a honeycomb formed body (also referred to as a second method for manufacturing a non-cam body).
- the kneading step includes a kneading step of forming the kneaded clay obtained in the kneading step into a predetermined shape. Or the method for manufacturing a honeycomb formed article according to [2].
- the first mixing is performed so that the residue (agglomerated mass) of the compound for molding (dry powder) on a sieve with an opening of 500 ⁇ m is 1% by mass or less.
- the mixing step is performed while applying pressure vibration to the forming raw material.
- the mixing step is performed using a mixer having a stirring blade, and the mixing is performed by rotating the stirring blade while stirring the molding raw material while reducing the shearing force.
- the mixing step and the kneading step are respectively performed by separate apparatuses, and the kneader that performs the mixing step and the kneader that performs the kneading step are directly connected to each other.
- alumina (Al 2 O 3) fine particles having an average particle diameter of 10 zm or less are used as a raw material for aggregate particles.
- Al (OH) aluminum hydroxide
- a honeycomb formed body is obtained by the manufacturing method according to any one of the above [1] to [25].
- a porous honeycomb structure is obtained by firing a honeycomb formed body, and one opening and the other opening of a number of cells of the porous honeycomb structure are plugged with each other.
- the plugged honeycomb structure is obtained by the above process, and the plugged honeycomb structure is fired, so that the fluid to be treated introduced into some cells flows through the porous partition walls and flows into the adjacent cells.
- a honeycomb formed body is obtained by the manufacturing method according to any one of the above [1] to [25], and one opening and the other opening of a large number of cells of the honeycomb formed body are exchanged.
- the plugged honeycomb formed body is obtained by plugging the plug in a different manner, and the fluid to be treated introduced into some cells is transmitted through the porous partition walls by firing the plugged honeycomb formed body. Then, a method for manufacturing a honeycomb filter for obtaining a honeycomb filter configured to capture impurities in a partition wall when flowing into an adjacent cell.
- a porous porous honeycomb structure having a large number of cells formed by being partitioned by porous partition walls, and one opening and the other opening of the large number of cells are alternated. And a plugging portion for plugging in the difference so that when the fluid to be treated introduced into some of the cells passes through the partition and flows into an adjacent cell, impurities are trapped in the partition.
- the soot leakage cell ratio evaluated by a soot print test is 1 cell / 1000 cells or less.
- honeycomb filter according to the above [28], wherein the honeycomb filter is constituted by at least a porous honeycomb structural body S and cordierite.
- the mixing step and the kneading step are performed independently.
- aggregates that can be formed by agglomeration of fine particles in the aggregate particle raw material contained in the forming raw material can be made more difficult to occur. Therefore, mixing of the agglomerates into the kneaded clay is suppressed.
- the method for manufacturing a honeycomb formed body according to the present invention and the method for manufacturing a honeycomb filter according to the present invention include, as preferable means, a method of applying a coating on the surface of an aggregate particle material, and classifying the aggregate particle material.
- a surfactant in addition to water.
- Aggregates are removed from the molding compound (wet powder) by various means such as mixing while reducing pressure vibration and mixing while reducing shear force due to rotation of the stirring blade.
- the pulverized aggregates can be uniformly dispersed in the molding compound (wet powder). Therefore, the incorporation of the agglomerates into the kneaded clay is suppressed, and at least the coarse agglomerates are prevented from being incorporated into the kneaded clay.
- the honeycomb filter according to the present invention According to the method for manufacturing a honeycomb formed body according to the present invention and the method for manufacturing a honeycomb filter according to the present invention, by taking these measures, agglomerates causing internal defects are crushed and lost. Therefore, the generation of internal defects can be easily prevented without complicating the process of once turning the aggregate particle material into a slurry and complicating the operation, and the strength can be improved. Further, the honeycomb filter according to the present invention has few internal defects, high strength, and excellent filtration performance (collection efficiency). In this specification, the strength refers to an isostatic strength which is a strength against isotropic pressing.
- FIG. 1 is a schematic view showing an example of a honeycomb filter using a porous honeycomb structure.
- FIG. 2 is a schematic diagram illustrating “honeycomb shape” using an example of a porous honeycomb structure.
- FIG. 3 is a schematic diagram illustrating an inspection device used for a soot print test.
- FIG. 4 is a graph showing the results of an isostatic strength test.
- the method for manufacturing a honeycomb formed body the method for manufacturing a honeycomb filter, and the best mode for implementing the honeycomb filter of the present invention will be specifically described.
- the present invention is not limited to these embodiments. It is not limited.
- Various changes, modifications, improvements, and substitutions can be made based on the knowledge of those skilled in the art without impairing the gist of the present invention.
- the same as described in the specification is used.
- similar or equivalent means may be applied, preferred means are those described below.
- the method for manufacturing a honeycomb formed article according to the present invention provides a first method for manufacturing a honeycomb formed article and a second method for manufacturing a honeycomb formed article.
- the method for producing each honeycomb formed body includes (i) a mixing step and (ii) a kneading step, and more preferably, the kneaded clay obtained in the kneading step is formed into a predetermined shape ( iii)
- a method for producing a honeycomb formed body having a clay kneading step to make the kneaded clay into a honeycomb shape iv) by performing a forming step.
- the term "manufacturing method of a honeycomb formed body according to the present invention” simply refers to both the first manufacturing method of a honeycomb formed body and the second manufacturing method of a honeycomb formed body.
- mixing first mixing
- mixing first mixing and Z or second mixing.
- mixing second mixing
- mixing first mixing and Z or second mixing.
- a molding compound (dry powder) is obtained by mixing (first mixing) two or more types of aggregate particle materials containing fine particles having an average particle size of 10 ⁇ m or less.
- first mixing two or more types of aggregate particle materials containing fine particles having an average particle size of 10 ⁇ m or less.
- the process proceeds to a kneading step.
- second method for manufacturing a honeycomb molded body water is further added and mixed (second mixing) to form a compound for molding. Get things (wet powder).
- the mixing step the fact that water, a dispersant, an additive, and the like are heated is described as an explanation of the mixing step.However, in the first manufacturing method for a honeycomb formed body, They are added in a kneading process.
- the aggregate particles are particles that are the main components of the porous honeycomb structure (sintered body), and the aggregate particle raw material is a material that is the raw material.
- Aggregate particle raw material in the present invention examples thereof include raw materials of Kojirai Hou, mullite, alumina, aluminum titanate, lithium aluminum silicate, silicon carbide, silicon nitride, and mixtures thereof.
- the aggregate particle material is not limited to ceramic but may be a metal.
- metallic silicon which is a constituent material of metallic silicon (Si) -silicon carbide (SiC) sintered body can be a raw material for aggregate particles in the present invention.
- cordierite raw material refers to a substance that is converted into cordierite by firing, for example, talc, kaolin, alumina, aluminum hydroxide, silica, or the like, having a composition after firing. Are mixed so as to have a theoretical composition of cordierite (2 Mg ⁇ 2Al ⁇ 5SiO).
- the aggregate particle raw material in the present invention contains fine particles having an average particle diameter of 10 ⁇ m or less.
- the fine particles contained therein are likely to aggregate to form an aggregate which causes internal defects of the honeycomb formed body (therefore, a porous honeycomb structure).
- a honeycomb formed body having few internal defects can be obtained.
- fine particles having an average particle diameter of 10 ⁇ or less include, for example, alumina (Al 2 O 3) fine particles (average particle diameter of about 11 ⁇ m ⁇ ) and aluminum hydroxide (A1 ( ⁇ H
- the method for producing a honeycomb molded body according to the present invention provides, as an aggregate particle raw material, an alumina (AlO) fine particle having an average particle diameter of 10 ⁇ or less and / or an average particle diameter of 10 ⁇ or less.
- AlO alumina
- average particle diameter refers to an X-ray transmission type particle size distribution analyzer (e.g., product (Name: Cedigraph 5000-02, manufactured by Shimadzu Corporation, etc.) means the value of 50% particle diameter.
- the molding raw material in the present invention contains at least two or more of the above-mentioned aggregate particle raw materials and water serving as a dispersing medium. If necessary, other additives (for example, pore-forming materials) may be used. Materials, binders, dispersants, etc.). [0055]
- the pore former is an additive for increasing the porosity and obtaining a high porosity porous honeycomb structure by burning out the honeycomb formed body to form pores during firing.
- Microphone capsules made of a foamed resin eg, acrylic resin microcapsules
- a foamed resin eg, acrylic resin microcapsules
- microcapsules made of foamed resin are hollow, a high porosity porous honeycomb structure can be obtained by adding a small amount of resin, and cracks are generated due to thermal stress, which generates less heat during firing. Can be reduced.
- the binder is an additive that imparts fluidity to the kneaded material at the time of honeycomb forming and functions as a reinforcing agent for maintaining the mechanical strength of the honeycomb formed body (honeycomb dried body) before firing.
- the binder for example, hydroxypropylmethylcellulose, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, or polyvinyl alcohol can be preferably used.
- the dispersant is an additive that promotes the dispersion of the raw material of the aggregate particles and the like in water and obtains a homogeneous molding compound. Accordingly, as the dispersant, a substance having a surface active effect, for example, ethylene glycol, dextrin, fatty acid stone, polyalcohol, or the like can be suitably used.
- the content of the dispersant (surfactant) is preferably less than 1.5% by mass. More preferably, it is 0.01-1% by mass. This is because a favorable dispersing effect can be obtained.
- the method of manufacturing a honeycomb formed article according to the present invention is characterized in that the mixing step is performed independently of a subsequent kneading step.
- the aggregate particles are sufficiently mixed (first mixing) in a drying step in which water is not added, so that the water is added (in the subsequent second mixing or kneading step) and then the molding is performed. Since each component of the raw material, that is, at least two or more types of aggregate particle material and water are uniformly dispersed, aggregates that can be formed by agglomeration of fine particles of the aggregate particle material are kneaded later. It becomes difficult to mix into the obtained clay.
- the generated agglomerates are also pulverized by the mixer used, so that the agglomerates can be further prevented from being mixed into the clay.
- a means for coating the surface of the raw material for aggregate particles in advance before mixing can be suitably used. In this case, the aggregation of the fine particles of the aggregate particle raw material is suppressed, and the generated aggregate is easily crushed.
- Aggregate particle raw materials having a coating on the surface include commercially available forces S, and aluminum hydroxide whose surface is treated with stearic acid to improve dispersibility.
- the aggregate particle material is classified in advance, and the mixed agglomerates are eliminated, whereby the mixing of the agglomerates into the clay can be suppressed.
- the classification can be performed by a cyclone (a device for separating and classifying using centrifugal force).
- the second method for manufacturing a honeycomb formed body water is further added to the forming compound (dry powder) obtained by mixing (first mixing) the raw material of the aggregate particles, and mixed ( The second mixing) is performed to obtain a molding compound (wet powder). At this time, water as a dispersion medium can be uniformly dispersed if it is mixed with the molding compound (dry powder) at a time. Often difficult. Therefore, in the second method for manufacturing a honeycomb formed article according to the present invention, the second mixing is performed by spraying water onto the forming compound (dry powder in which two or more types of aggregate particle raw materials are mixed). It is preferred to do so.
- specific means for mixing is not limited, but it is preferable that the mixing be performed while applying pressure vibration to the forming raw material using a predetermined mixer.
- the agglomerates are pulverized, and the incorporation of the agglomerates into the clay can be suppressed.
- An ultrasonic dispersing machine that realizes pressurized vibration by ultrasonic waves is used as a mixer that realizes such mixing, a molding raw material and cobblestone are housed in a container, and the container is vibrated to perform pressurized vibration.
- An example is a pot mill that appears.
- mixing by a pot mill is an excellent means for obtaining the effect of uniformly dispersing the constituent components of the forming raw material.
- Mixers used for mixing can be used in addition to those described above, and can be selected according to the aggregate to be ground.
- the mixing machine can be either an indirect mixing system or a direct mixing system. It can be used.
- As the indirect mixing method in addition to the above-described ultrasonic disperser, there is a mixer (for example, Flash Blender manufactured by Ako Ichi Co., Ltd.) for mixing by air bubbles (air mixing / air ratio).
- the direct mixing method is further classified into an outer shell movement method, an inner movement method, or a mixer that combines the outer shell movement method and the inner movement method.
- Specific examples of the outer motion type mixer include a double cone type mixer, a V type mixer, a concrete mixer, and a rocking mixer.
- the inner motion type are a ribbon type mixer and a screw type mixer.
- examples include a mixer, a Warner mixer, a kneader mixer, a universal mixing stirrer, a Nauta mixer (for example, manufactured by Hosokawa Micron Corporation), and the like.
- Specific examples of the mixer that combines the outer shell motion method and the inner motion method include a pan rotation type forced mixer and an omni mixer (diffusion mixing, for example, manufactured by Chiyoda Giken Kogyo Co., Ltd.).
- the mixing is included in the forming raw material.
- Agglomerates formed by agglomeration of fine particles in the aggregate particle raw material can be pulverized, and it is possible to prevent the agglomerates from being mixed into the clay.
- the mixing immediately before the kneading step that is, the molding compound obtained by mixing the aggregate particle materials (first mixing)
- the mixing (second mixing) in which water is added to (dry powder) if the mixing is performed while stirring while applying a shearing force, the effect of suppressing the agglomerates from being mixed into the kneaded clay is great.
- a mixer that has been generally used for mixing powders and rotates a stirring blade at a low speed of about 20 to 200 rpm (for example, Sigma Kneader) , Ribbon mixers, etc.) have insufficient stirring power and dispersing power, and it is desirable to use a mixer with excellent stirring power and dispersing power that can rotate the stirring blade at higher speed.
- a mixer having excellent stirring power and dispersing power for example, an ultra-high-speed shear omni-mixer manufactured by Chiyoda Giken Kogyo Co., Ltd., and a kneader manufactured by Vertical Co., Ltd. manufactured by Baurek Co., Ltd. High-speed agitation granulator ⁇ SPG series, axial mixer manufactured by Sugiyama Heavy Industries Co., Ltd., high speed beader manufactured by Taiheiyo Kie Co., Ltd., Hosokawa Micron Co., Ltd. Turbulizer, Super Mixer, manufactured by Rikiota Co., Ltd., and R-type Eiritsu mixer manufactured by Nippon Airitz Co., Ltd.
- a plow-shaped or shovel-shaped stirring blade (professional shear) and a cross-shaped knife are provided in a horizontal cylindrical drum.
- a blade-shaped agitating blade chopper
- the professional shear rotates at low speed around a horizontally arranged drive shaft
- the chitose rotates at high speed around a vertically arranged drive shaft.
- the floating diffusion action by the flow shear and the high-speed shearing action by the chopper are combined to pulverize the aggregate formed by agglomeration of the fine particles contained in the forming raw material, It is possible to obtain a molding compound in which pulverized aggregates are uniformly dispersed.
- a multi-stage blade including an emperor-shaped lower stage stirring blade and a ring-shaped upper stage stirring blade is provided in a vertical cylindrical drum, and the multi-stage blade is centered on a drive shaft arranged vertically.
- a Henschel mixer for example, trade name: Mitsui Henschel mixer, manufactured by Mitsui Mining Co., Ltd.
- Mitsui Henschel mixer which is a type of mixer rotating at a high speed
- fine particles contained in the forming raw material are aggregated by the combination of the upward stirring operation of the forming raw material by the lower stirring blade and the strong shearing operation of the upper stirring blade.
- the formed aggregates are pulverized to obtain a molding compound in which the pulverized aggregates are uniformly dispersed.
- the forming raw material adheres to the stirring blade itself, which has a low volume efficiency due to the presence of the stirring blade, or between the container and the stirring blade, and the raw material recovery rate is low. Inferior. In addition, it is necessary to consider the possibility of contamination of the molding material as a result of wear of the stirring blade. Furthermore, a difference in the peripheral speed between the root and the outer periphery of the stirring blade occurs, so that it is difficult to disperse uniformly in the volume. Therefore, when these points become a problem, pressurized vibration is applied by means of coating the surface of the aggregate particle material, means of classifying the aggregate particle material, ultrasonic waves or a pot mill as described above. It is preferable to employ means for mixing while mixing.
- the number of rotations per hour of the stirring blades is The speed is generally not limited as long as it is higher than 200 rpm, but the preferable rotation speed is 500 m or more, and more preferably, 1000-5000 rpm.
- the peripheral speed of the stirring blade is not limited, but a preferred peripheral speed is 2 m / sec or more, more preferably 3-100 m / sec. If the number of revolutions is less than 500 rpm or the peripheral speed is less than 2 mZ seconds, there is a high possibility that the agglomerates are insufficiently pulverized as compared with preferable conditions.
- the upper limit is not limited as long as the stirring blades can be driven stably and continuously.However, in consideration of the possibility of progression of blade wear and breakage of blades, the number of revolutions is 5000 rpm.
- the peripheral speed is preferably 100 m / sec or less.
- the peripheral speed of the stirring blade means a moving speed of the tip of the stirring blade.
- the stirring time is not particularly limited. For example, when the stirring blade is rotated at 500 rpm, it is preferably 5 to 30 minutes, and when the stirring blade is rotated at 100 rpm, it is preferably 320 minutes. .
- the stirring time is shorter than the above range, it is preferable in that it may not be possible to prevent the occurrence of internal defects in the honeycomb formed body (and, consequently, the porous honeycomb structure), which tends to cause insufficient pulverization of agglomerates. Exceeding the above range is not preferable in that the wear of the mixer is likely to progress and its useful time may be shortened.
- the term "crushed agglomerates” refers to not only those in which the agglomerates are completely pulverized and returned to the state of fine particles as primary particles, but also those in which the agglomerates are not completely pulverized. These include those having a reduced particle diameter.
- the average particle diameter of the pulverized aggregate is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and particularly preferably 50 ⁇ m or less.
- the mixing state of the raw materials is determined by the mixture for molding obtained by the first mixing.
- (Dry powder) can be evaluated by sieving with a sieve having an opening of 500 xm and measuring the mass of the residue (agglomerated mass) on the sieve.
- the mixing be performed until the agglomeration force on the sieve becomes 1% by mass or less.
- Better Mixing is preferably performed until the content becomes 0.2% by mass or less.
- the mixed state of the raw materials can be evaluated by a thermogravimetric balance. Specifically, a predetermined amount (for example, 20 mg) of a molding compound (dry powder) or a molding compound (wet powder), which is a mixture, is sampled, and the binder and the crystallization water of the raw material are sampled using a thermogravimetric balance (TG). Measure the mass loss. This is repeated a predetermined number of times (for example, 10 times), and the variation in the mass reduction rate of TG is evaluated. For example, when aluminum hydroxide, which easily aggregates, is used, if the mixing is not sufficient, the aluminum hydroxide segregates, and the variation in the mass reduction rate of TG increases.
- TG thermogravimetric balance
- the value obtained by dividing the standard deviation of the mass reduction rate by the average value of the mass reduction rate (hereinafter referred to as the TG mixing degree) is 0.2 or less. It is preferable to mix. More preferably, the mixture is mixed until it becomes 0.1 or less.
- the TG mixing degree is about 0.5
- the TG mixing degree is about 0.5. It is difficult to make it less than 2. It is needless to say that the evaluation based on the degree of TG mixing can be performed even when using a kneaded clay or a dried product of a compact.
- the mixed state of the raw materials can be evaluated using X-ray CT.
- the density distribution of the honeycomb formed body is measured by X-ray CT. If the density distribution is uniform, it can be determined that the raw materials have been uniformly mixed. Until the value obtained by dividing the standard deviation of the density measurement value by X-ray CT by the average value of the density measurement value by X-ray CT (referred to as X-ray CT mixture in this specification) is less than 0.2, Mixing is preferred. More preferably, it is mixed until it becomes 0.1 or less. It is needless to say that the evaluation using the degree of X-ray CT mixing can be performed even when using a kneaded clay formed into a predetermined shape using a vacuum kneading machine or the like for a honeycomb formed body.
- the method for manufacturing a honeycomb formed body according to the present invention has an effect of uniformly dispersing the constituent components of the forming raw material and a method of pulverizing an aggregate formed by agglomeration of fine particles. Effects.
- microcapsules and the like made of a foamed resin that is preferably used as a pore-forming material have been conventionally difficult to uniformly disperse in a forming raw material because of their low specific gravity. According to the method for producing a body, such a component having a small specific gravity can be uniformly dispersed.
- the method for manufacturing a honeycomb formed body according to the present invention can be suitably used when a raw material containing microcapsules made of a foamed resin as a pore former is used.
- a phenomenon in which the pore forming material content of the molding compound (and thus the clay and the honeycomb formed body) varies from site to site can be avoided, so that a porous honeycomb structure having no variation in porosity depending on the site can be obtained. It is preferable in that it can be obtained.
- the opening of the die has a slit width of the die as an aggregate particle material. It is preferable to use one containing powder that has passed through a 4Z5 or less sieve. More preferably, a powder containing a powder that has passed through a sieve whose opening is 1/2 or less the slit width of the die is used.
- the kneading step is a step of obtaining a kneaded material by kneading the molding compound (wet powder) obtained in the mixing step in the second method for manufacturing a honeycomb formed body according to the present invention.
- water is added to the forming compound (dry powder) obtained in the mixing step and kneaded to obtain a kneaded material.
- a dispersant, an additive, and the like can be added in this kneading step. According to the content already described in the mixing step (considering the second production method) (the description is omitted).
- Kneading can be performed by a conventionally known kneading machine, for example, a sigma kneader, a Banbury mixer, a screw-type extrusion kneading machine, or the like.
- a conventionally known kneading machine for example, a sigma kneader, a Banbury mixer, a screw-type extrusion kneading machine, or the like.
- the mixing step and the kneading step described above are performed by separate apparatuses, and the mixing step is performed. It is preferable that the kneader and the kneader performing the kneading step are directly connected. For transport This is because the possibility that the fine particles aggregate again to form an aggregate can be reduced.
- the clay kneading step is a step of forming the kneaded clay obtained as described above into a predetermined shape.
- a preferable shape is a cylindrical shape.
- the kneading can be performed by a conventionally known kneading machine, for example, a screw-type extruding kneading machine.
- a kneading machine e.g., vacuum vacuum kneading machine
- a vacuum depressurizing device for example, a vacuum pump or the like
- the use of such a material is preferable in that a kneaded material having few defects and good formability can be obtained.
- the forming step is a step in which the kneaded clay obtained as described above is formed into a honeycomb shape in which a large number of cells are partitioned and formed by partition walls, and dried to obtain a honeycomb formed body.
- the "honeycomb shape” in the present specification means a shape in which a large number of cells 3 are defined and formed by partition walls 4, for example, as in a porous honeycomb structure 1 shown in FIG. (2)
- the overall shape of the two-cam molded body is not particularly limited, and examples thereof include a cylindrical shape as shown in FIG.
- the cell shape of the honeycomb formed body (the cell shape in a cross section perpendicular to the cell formation direction) is not particularly limited. For example, in addition to the square cell shown in FIG. Examples of the shape include cells.
- the molding method is not particularly limited, and the kneaded clay obtained as described above can be complemented with the partition walls by a force that can use a conventionally known molding method such as extrusion molding, injection molding, or press molding. It is preferable to extrude using a die having a slit having a typical shape. By such a method, a honeycomb formed body having a desired cell shape, partition wall thickness, and cell density can be easily obtained.
- the mode of the back hole for introducing the clay into the slit is not limited.
- a die having a back hole at every other intersection of the slits may be used, or extrusion molding may be performed using a die having a back hole at every intersection of the slits.
- the base is provided with a back hole at all intersections of the slit.
- the crimping point of the clay is the intersection of the cells, and the clay is gathered and crimped from four directions. If the strength is poor, a defect is likely to occur at the intersection, and the defect reduces the isostatic strength. If a die having back holes at all the intersections of the slit is used, the clay is not pressed at the intersections, so that even if a defect occurs, the decrease in the isostatic strength does not easily occur.
- a base provided with an R (having a curved surface) in at least a part of a corner of a cell block forming a slit. Is preferred. It is more preferable to use a base in which R is attached to all corners of the cell block.
- R By adding R to the corners of the cell block of the die, the area of the intersection of the die becomes wider and the flow of the clay becomes better, so that it becomes difficult to form internal defects such as cuts and sasare in the honeycomb formed body . Further, since the intersections of the honeycomb formed body are reinforced, the strength of the honeycomb formed body is improved, and the isostatic strength can be increased.
- the apparatus for performing the extrusion molding is not particularly limited, and can be performed by a conventionally known extruder (for example, a ram-type extruder or the like). Above all, it is preferable to use a twin-screw continuous molding machine. .
- the twin-screw continuous molding machine is preferable in that a uniform molded body can be obtained as compared with other extrusion molding machines.
- the kneading step and the molding step can be performed integrally, and the productivity is excellent.
- a twin-screw continuous mixing and extruding machine As a kneading and forming machine for realizing such a process, there is a twin-screw continuous mixing and extruding machine.
- the kneaded material be extruded from a die after passing through a screen having an opening force of 60 to 278 ⁇ m. By doing so, even if the agglomerates cannot be crushed in the mixing step described above, the agglomerates can be removed, so that the inside of the honeycomb formed body (and, consequently, the porous honeycomb structure) can be more reliably. The occurrence of defects can be prevented. If the opening of the screen is less than the above range, it is difficult to remove the agglomerates. It is not preferable in that it may not be possible to prevent the occurrence of internal defects.
- the drying method is not particularly limited, and a conventionally known drying method such as hot air drying, microwave drying, dielectric drying, reduced pressure drying, vacuum drying, and freeze drying can be used.
- a drying method in which hot air drying and microwave drying or dielectric drying are combined is preferable in that the entire honeycomb formed body can be dried quickly and uniformly.
- the method for manufacturing a honeycomb filter according to the present invention includes obtaining a honeycomb formed body by the above-described method for manufacturing a honeycomb formed body, firing the honeycomb formed body to obtain a porous honeycomb structure, and obtaining a large number of porous honeycomb structures.
- the plugged honeycomb structure was obtained by alternately plugging one opening of the cell and the other opening, and was introduced into some cells by firing the plugged honeycomb structure.
- the present invention provides a honeycomb filter configured such that when a fluid to be treated permeates through a porous partition wall and flows into an adjacent cell, the partition wall traps foreign substances. Since such a manufacturing method uses a honeycomb formed body having few internal defects and high strength, it is possible to manufacture a honeycomb filter having excellent filtration performance (collection efficiency).
- the method of plugging one opening and the other opening of a number of cells of the porous honeycomb structure differently is not particularly limited.
- one end face of the porous honeycomb structure may be used.
- a pressure-sensitive adhesive sheet is adhered to the mask, and a hole is formed only in a portion of the pressure-sensitive adhesive sheet corresponding to a cell to be plugged by a laser camera or the like utilizing image processing to form a mask, and the mask is adhered.
- the end face of the formed porous honeycomb structure is immersed in the ceramic slurry, and the cells to be plugged of the porous honeycomb structure are filled with the ceramic slurry to form plugged portions. Then, after performing the same process on the other end face of the porous honeycomb structure, the plugged portion is dried and fired.
- the ceramic slurry can be prepared by mixing at least an aggregate particle raw material and a dispersion medium (eg, water or the like). Further, if necessary, additives such as a binder and a dispersant may be added.
- a dispersion medium eg, water or the like.
- additives such as a binder and a dispersant may be added.
- the kind of the aggregate particle raw material is not particularly limited, the same aggregate particle raw material as the raw material for the honeycomb formed body can be suitably used. It is preferable to use a resin such as polyvinyl alcohol and methylcellulose as the noinder and a special carboxylic acid type polymer surfactant as the dispersant.
- the viscosity of the ceramic slurry is preferably adjusted within the range of 5-50 Pa's, and more preferably adjusted within the range of 10-3 OPa's. If the viscosity of the ceramic slurry is too low, sink marks tend to occur easily.
- the viscosity of the slurry can be adjusted by, for example, the ratio between the aggregate particle raw material and the dispersing medium (for example, water) or the amount of the dispersant.
- the firing means an operation for sintering and densifying the aggregate particle raw material to secure a predetermined strength.
- the firing conditions (temperature and time) differ depending on the type of the aggregate particle material used, since the firing of the honeycomb formed body and the firing of the plugged portion differ depending on the type of the aggregate particle material used to form them.
- Condition may be selected. For example, when a cordierite-forming raw material is used as an aggregate particle raw material, it is preferable to bake at a temperature of 1410 to 1440 ° C. for 3 to 7 hours. If the firing conditions (temperature and time) are less than the above ranges, the sintering of the aggregate particle raw material may be insufficient. If the firing conditions (temperature and time) exceed the above ranges, the generated cordierite may be melted. This is not preferred in terms of point.
- the honeycomb filter according to the present invention is manufactured by the above-described method for manufacturing a formed honeycomb article.
- a plugged honeycomb formed body is obtained by obtaining a two-cam molded body, and plugging one opening and the other opening of a number of cells of the honeycomb formed body with each other and differently, thereby obtaining a plugged honeycomb formed body.
- By baking the molded body when the fluid to be treated introduced into some of the cells passes through the porous partition wall and flows into the adjacent cells, the partition walls trap the foreign substances. It can also be manufactured by a method for obtaining a honeycomb filter configured as described above.
- the manufacturing method as described above uses a honeycomb formed body having low internal defects and high strength similarly to the above-mentioned manufacturing method, so that a honeycomb filter having excellent filtration performance (collection efficiency) is used. Since it is possible to manufacture, it is possible to perform the baking of the honeycomb molded body and the baking of the plugged portion at a time, so that the baking operation can be reduced and the honeycomb filter can be obtained more easily. There is an advantage that can be. The plugging and firing in this manufacturing method can be performed in exactly the same manner as in the previous method.
- the honeycomb filter according to the present invention has a porous honeycomb structure having a large number of cells formed by being partitioned by porous partition walls, and has a structure in which one opening and the other opening of the large number of cells are alternately arranged. And a plugging portion for sealing, so that when the fluid to be treated introduced into some of the cells passes through the partition and flows into an adjacent cell, impurities are trapped in the partition. It is characterized by the fact that the soot leakage cell ratio evaluated by the soot print test is 1 cell / 1000 cells or less.
- the "soot print test" refers to a method in which particles are poured into a cell from one end surface side of a honeycomb filter and collected on a gas-permeable screen adhered to the other end surface side. This is a method of inspecting the internal defects of the honeycomb filter using the image of the honeycomb filter (for example, see Japanese Patent Publication No. 5-658).
- the soot print test includes, as shown in FIG. 3, a support 32 for supporting the honeycomb filter 21 in a state where the periphery thereof is hermetically sealed, and a graphite particle connected to the support 32.
- a soot generator 34 that supplies gas
- a screen 36 that collects graphite particles
- an exhaust pipe 38 that collects gas that has passed through the screen 36.
- Reference numeral 40 denotes an air supply pipe
- reference numeral 42 denotes a switching valve
- reference numeral 44 denotes an exhaust pipe
- reference numeral 46 denotes a holding mesh.
- the partition wall 24 of the honeycomb filter 21 has no internal defects, the graphite particles are trapped in the partition wall 24 of the honeycomb filter 21, so that an image of the graphite particle is not formed on the screen 36. Les ,.
- the graphite particles flow into the adjacent cell 23 through the partition wall 24 of the honeycomb filter 21 and are collected by the screen 36. An image of the graphite particles is formed on the screen 36.
- the soot leakage cell ratio is obtained by converting the number of cells on which an image of graphite particles formed on the screen is formed into the number of cells per 1000 cells.
- the soot leakage cell ratio which was about 2-20 cells / 1000 cells in the conventional honeycomb filter, has been improved to a level of 1 cell / 1000 cells or less.
- Such a honeycomb filter is excellent in filtration performance (collection efficiency) with few internal defects.
- the honeycomb filter according to the present invention is preferably formed of at least a porous honeycomb structure (that is, a portion other than the plugged portion) made of cordierite.
- Cordierite is preferable since it has a small coefficient of thermal expansion and thus has excellent thermal shock resistance and can effectively prevent cracks due to thermal stress.
- Examples [0111] Hereinafter, the present invention will be described specifically with reference to Examples, but the present invention is not limited to these Examples.
- the average particle size described in the following Examples and Comparative Examples is based on the liquid-phase sedimentation method of Stotas, and is detected by the X-ray transmission method.
- the value of 50% particle diameter measured by a measuring device for example, trade name: SEDIGRAPH 5000-02, manufactured by Shimadzu Corporation was used.
- talc (average particle diameter 21/1 111) 40 mass%, kaolin (average particle diameter 11 / im) 18.5 mass%, alumina (average particle diameter 7 ⁇ m) 14.
- a raw material of cordierite was prepared by mixing 0 mass%, aluminum hydroxide (average particle diameter 2 ⁇ m) 15 mass%, and silica (average particle diameter 25 ⁇ m) 12.5 mass%.
- Example 1 (Quality m%) Ratio (, 1/1000) Strength (MPa)
- Example 1 0.0 0.05 0.09 0.2 1.9
- Example 2 0.0 0.03 0.05 0.1 1.8
- Example 3 0.0 0.02 0.03 0.0 2.3
- Example 4 0.0 0.01 0.02 0.0 2.1
- Example 5 0.0 0.01 0.02 0.0 2.2
- Example 6 0.03 0.05 0.0 2.5
- Example 7 0.0 0.02 0.03 0.0 2.2
- Example 8 1 0.20 0.34 1.0 1.1
- Example 9 0.07 0.08 0.14 0.2 1.5
- Example 10 0.0 0.03 0.05 0.0 2.3
- Example 1 1 0.1 0.05 0.09 0.1 1.9
- Example 1 2 0.0 0.03 0.05 0.0 2.2
- Example 1 3 0.2 0.12 0.20 0.3 1.4
- Example 1 4 0.05 0.06 0.10 0.1 1.8
- Example 1 5 0.07 0.07 0.12 0.9 1.0 Comparative example 1 5.0 0.60 1.02 4.0 0.7 Comparative example Two
- the obtained molding compound (wet powder) is kneaded with a sigma kneader, and further, a screw-type extrusion kneader equipped with a vacuum decompression device (vacuum The kneaded material was extruded into a cylindrical shape (outer diameter: 300 mm ⁇ ) by kneading with a kneading machine.
- a slit having a shape complementary to the partition wall of the honeycomb formed body was provided, a back hole was provided at all intersections of the slit, and a corner of a cell block constituting a cell was formed.
- the R-caroed (R-added) was used, and extrusion was performed using a ram-type extruder as a molding machine.
- a molded article was obtained in which the compartment was formed.
- a screen having a mesh size of 233 ⁇ m was arranged inside the ram-type extruder, and the kneaded material was extruded from the die after passing through the screen.
- This molded product was completely dried by dielectric drying and hot-air drying to obtain a honeycomb molded body.
- This honeycomb formed body was cut at both end faces so as to have a predetermined size.
- the obtained honeycomb formed body had an end face (cell opening surface) shape force, an outer diameter of 229mm, a circular shape having a diameter of 254mm, a cell shape of 1.16mm X l.
- the force was S300 / im
- the cell density was about 300 cells / in 2 (46.5 cells / cm 2 )
- the total number of cells was 19085 cells.
- a plugged honeycomb formed body was obtained by alternately plugging one opening and the other opening of a large number of cells of the honeycomb formed body obtained as described above.
- a plugging method an adhesive sheet is adhered to one end face of the honeycomb formed body, and holes are formed only in portions of the adhesive sheet corresponding to cells to be plugged by laser processing using image processing. Open it to form a mask, immerse the end face of the honeycomb molded body on which the mask is stuck in ceramic slurry, fill the cells to be plugged of the honeycomb molded body with ceramic slurry, and plug in the plugged portion.
- a plugging method an adhesive sheet is adhered to one end face of the honeycomb formed body, and holes are formed only in portions of the adhesive sheet corresponding to cells to be plugged by laser processing using image processing. Open it to form a mask, immerse the end face of the honeycomb molded body on which the mask is stuck in ceramic slurry, fill the cells to be plugged of the honeycomb molded body with ceramic slurry, and plug
- the same aggregate particle material as that of the honeycomb formed body was used as the aggregate particle material, and 0.5 parts by mass of methylcellulose as a binder and 0.5 part by mass as a dispersant per 100 parts by mass of the aggregate particle material.
- Carboxylic acid-type polymer surfactant (trade name: BOYS 530, manufactured by Kao Corporation) 0.3 part by mass, and 50 parts by mass of water as a dispersion medium are added, and the mixture is prepared by mixing for 30 minutes. Using. Its viscosity was 25 Pa's.
- the plugged honeycomb formed body obtained as described above was completely dried by hot-air drying, and then fired at a temperature of 1420 ° C for 7 hours. When the fluid to be treated introduced into some of the cells permeated through the porous partition and flowed into the adjacent cells, a honeycomb finoleta configured to capture impurities in the partition was obtained. .
- a support base for supporting the honeycomb filter 21 in a state in which its peripheral edge is hermetically sealed as shown in FIG. 3 2
- a soot generator 34 connected to the support 32 for supplying gas containing graphite particles
- a screen 36 for collecting graphite particles (using a white cloth), and a gas passing through the screen 36
- the inspection was performed using an inspection device including the exhaust stack 38 to be collected.
- the honeycomb filters 21 of Example 1 and Comparative Example 1 were placed on the support 32, and the exhaust pipe 38 was set on the upper end surface of the honeycomb filter 21. And the exhaust stack 38.
- a gas containing graphite particles supplied from the soot generator 34 at a rate of about 70 g / hour is poured into the cell from one end face of the honeycomb filter 21, and the soot is supplied to the honeycomb filter 21 at a rate of 5 g / liter. Deposited.
- the exhaust pipe 38 is set again from above the screen 36, and the honeycomb filter 21 and the screen 36 are connected to the support base 32 and the exhaust pipe 38. It was fixed while sandwiched between.
- a gas containing graphite particles supplied in an amount of about 70 gZ hours is supplied to the soot generator 34 from one end face of the honeycomb filter 21 into the cell 23, and a gas-permeable gas is adhered to the other end face.
- the image (ie, black spot) of the graphite particles collected on the screen 36 was observed, and the number was counted.
- honeycomb filter was subjected to an isostatic strength test in accordance with the automotive standard JASO standard M505-87 issued by the Japan Society of Automotive Engineers of Japan.
- samples no, two-cam filters
- isotropic compression is carried out in water with a lid covered with an aluminum plate.
- This test simulates the compressive load applied when the outer peripheral surface of the honeycomb filter is gripped by the can of the converter.
- the test result is shown as the pressure value when each honeycomb filter breaks. Table 1 shows the results.
- a honeycomb formed body was produced and produced in the same manner as in Example 1 except that the ratio of the surfactant in the molding raw material was changed to 0.1 part by mass (Example 2) and 1 part by mass (Example 3).
- a honeycomb filter was manufactured from the obtained honeycomb formed body, and each evaluation was performed in these processes. Table 1 shows the results.
- a honeycomb formed body was prepared in the same manner as in Example 1 except that aluminum hydroxide as a forming raw material was surface-modified with stearic acid, and the ratio of surfactant in the forming raw material was changed to 0.1 part by mass.
- Example 1 aluminum hydroxide was used in advance to classify with a free vortex centrifugal classifier to remove agglomerates, and was carried out except that the ratio of surfactant in the molding raw materials was 0.1 parts by mass.
- a honeycomb formed body was manufactured, a honeycomb filter was manufactured from the obtained honeycomb formed body, and each evaluation was performed in these processes. The results are shown in Table 1.
- a pot mill was used as a mixer, and the first pore former and the second pore former were added to the aggregate particle material excluding aluminum hydroxide. For 2 minutes to obtain a molding compound (dry powder).
- the ratio of the surfactant (dispersant) in the molding raw material was set to 0.1 part by mass.
- Aluminum hydroxide is added to a mixed solution of a dispersant and a dispersion medium, and a dispersion obtained by ultrasonication is added to the above pot mill, and mixed for 5 minutes to form a molding compound (wet powder).
- a honeycomb formed body was manufactured in the same manner as in Example 1, and a honeycomb formed body was obtained from the obtained honeycomb formed body. A honeycomb filter was manufactured, and each evaluation was performed during these processes. Table 1 shows the results.
- the ratio of the surfactant (dispersant) in the molding raw material was set to 1 part by mass, and kneading and molding were continuously and integrally performed in the kneading step and the molding step using a twin-screw continuous mixing extruder. Except for this, a honeycomb formed body was manufactured in the same manner as in Example 1, and a honeycomb filter was manufactured from the obtained honeycomb formed body, and each evaluation was performed in these processes. The results are shown in Table 1.
- Example 8 mixing was performed using a super mixer (manufactured by Kadita Corporation) at a rotation speed of the stirring blade of 500 rpm and a peripheral speed of 2 m / sec.
- Example 9 mixing was performed by using a high speed beader (manufactured by Taiheiyo Kikai Co., Ltd.) at a rotation speed of the stirring blade of 700 rpm and a peripheral speed of 6 m / sec.
- Example 10 mixing was performed using an ultra-high-speed shear omni-mixer (manufactured by Chiyoda Giken Kogyo Co., Ltd.) with the rotation speed of the stirring blade being 4000 rpm and the peripheral speed being 10 m / sec.
- Example 11 kneading was performed using a high-speed stirring granulator (manufactured by Dalton) at a rotation speed of the stirring blade of 1000 rpm and a peripheral speed of 7 m / sec.
- Example 12 mixing was carried out using a Vertical Darauniurator (manufactured by Parec Co., Ltd.) with the rotation speed of the stirring blade being 5000 rpm and the peripheral speed being 9 m / sec.
- Example 13 mixing was performed using a Henschel mixer (trade name: Mitsui Henschel Mixer, manufactured by Mitsui Mining Co., Ltd.) at a rotation speed of the stirring blade of 600 rpm and a peripheral speed of 4.5 m / sec.
- a Henschel mixer trade name: Mitsui Henschel Mixer, manufactured by Mitsui Mining Co., Ltd.
- the amount of the first pore former (carbon) was 5.0 parts by mass with respect to 100 parts by mass of the aggregate particle material, and acrylic resin microcapsules (average particle diameter) were used as the second pore former. This amount was set to 2.2 parts by mass with respect to 100 parts by mass of the aggregate particle material, and the amount of the dispersant (surfactant) of the molding material was set to 0.1 part by mass.
- a professional shear mixer (trade name: professional shear mixer, manufactured by Taiheiyo Kikai Co., Ltd.) was used.
- the first pore former (carbon) was used as an aggregate particle material.
- a second pore former was further added and mixed for 3 minutes.
- the stirring conditions of the professional shear mixer were such that the rotational speed of the professional shear drive shaft was 100 rpm, the rotational speed of the chopper drive shaft was 3 OOOrpm, and the peripheral speed of the chopper drive shaft was 40 m / sec. Except for the above conditions, a honeycomb formed body was manufactured in the same manner as in Example 1, a honeycomb filter was manufactured from the obtained honeycomb formed body, and each evaluation was performed during these processes. Table 1 shows the results.
- the mixer in the mixing process was changed, and in the molding process, a slit having a shape complementary to the partition wall of the honeycomb molded body was provided as a mouthpiece, a back hole was provided at every other intersection of the slits, and the cell was installed.
- a honeycomb formed body was manufactured in the same manner as in Example 1 except that the corners of the constituent cell blocks were not subjected to R processing, and a honeycomb formed body was manufactured. Filters were manufactured and each evaluation was performed during these processes. The results are shown in Table 1.
- the mixer used was a high speed beader (manufactured by Taiheiyo Kikai Co., Ltd.), and the mixing speed was 700 rpm and the peripheral speed was 20 m / sec.
- a honeycomb formed body was prepared in the same manner as in Example 1 except that the amount of the dispersant (surfactant) of the forming raw material was 0.1 part by mass and mixing was performed for 60 minutes using a sigma kneader as a mixer.
- a honeycomb filter was manufactured from the manufactured and obtained honeycomb formed body, and each evaluation was performed in these processes. The results are shown in Table 1.
- a honeycomb formed body was manufactured in the same manner as in Example 1, except that the ratio of the surfactant in the forming raw material was changed to 2 parts by mass, and a honeycomb filter was manufactured from the obtained honeycomb formed body. I tried to do each evaluation in. However, in the pot mill, the wet powder was in an agglomerated state and could not be taken out.
- Example 3 Except for changing the mixer in the mixing step, a honeycomb formed body was manufactured in the same manner as in Example 1, and a honeycomb filter was manufactured from the obtained honeycomb formed body, and each evaluation was performed during these processes. . Table 1 shows the results.
- Nautamixer Hosokawami The mixing speed was 300 rpm and the peripheral speed was 1.5 m / sec.
- Comparative Example 4 mixing was performed using a ribbon mixer (manufactured by Dalton) at a stirring blade rotation speed of 100 rpm and a peripheral speed of 0.5 m / sec.
- a die is provided at every other intersection of the back hole and the slit that introduces the clay into the slit, and the end surface (cell opening surface) is formed according to the manufacturing procedure of the honeycomb formed body of Example 1.
- the target value of the cell structure was determined as follows: the partition wall thickness was 306 zm (12 mil), and the cell density was about 200 cells Z square inch (cpsi). ), 10 bodies were produced. Thereafter, each was plugged, dried, and fired in accordance with the honeycomb filter manufacturing procedure of Example 1 to obtain 10 (sample No. 110) honeycomb filters.
- the cell structure of the honeycomb filter was 313.65 ⁇ (12.3 mil) and the cell density was about 197 cells per square inch (cpsi) on average.
- Example 16 Except that a back hole for introducing kneaded clay into the slit was provided at all intersections of the slit as a die, the same procedure as in Example 16 was performed to prepare 10 honeycomb filters (sample Nos. 1 to 10). Each was subjected to a test for isostatic strength. The average cell structure was 311.1 ⁇ (12.2 mil), and the cell density was about 191 cells / square inch (cpsi). Table 2 shows the results of Example 3 of the test for isostatic strength, and FIG. 4 shows the average value of 10 samples.
- the honeycomb filter of Example 1-15 has a soot leakage cell ratio of 1.0 cells / 1000 cells or less, has few internal defects, and has excellent filtration performance (collection efficiency).
- the honeycomb filter of Comparative Examples 14 to 14 had 1.5 or more 1000 senoles or more, had not less than a few internal defects, and had insufficient filtration performance (collection efficiency).
- honeycomb filters of Example 1 and Comparative Example 1 the portions where soot leakage occurred were cut and observed, and the honeycomb filters of Example 1 had small holes with a hole diameter of about 0.5 mm. This was an acceptable level for the degree of internal defects.However, in the honeycomb filter of Comparative Example 1, nicks and cuts of about 10 to 100 mm in length were observed to a considerable extent. The level of the level exceeded the allowable level.
- Example 17 From the results shown in Table 2 and Fig. 4, the lowest value of Example 17 was not lower than the highest value of Example 16, and the average value of Example 17 was about 57% as compared with Example 16. I understand that it is improving.
- the method for manufacturing a honeycomb formed article according to the present invention can be suitably used for manufacturing a honeycomb filter having few internal defects, high strength, and excellent filtration performance (collection efficiency).
- the honeycomb filter according to the present invention captures dust and water used in applications such as environmental measures such as pollution prevention and product recovery from high-temperature gas, and particularly traps particulates discharged from diesel engines. It can be suitably used as a collected diesel particulate filter.
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Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP04771720A EP1657039B1 (en) | 2003-08-20 | 2004-08-17 | Method for manufacturing a ceramic honeycomb filter |
JP2005513277A JP4456077B2 (ja) | 2003-08-20 | 2004-08-17 | ハニカム成形体の製造方法、ハニカムフィルタの製造方法、及びハニカムフィルタ |
US10/567,906 US20060257620A1 (en) | 2003-08-20 | 2004-08-17 | Method for manufacturing honeycomb formed article, method for manufacturing honeycomb filter, and honeycomb filter |
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PCT/JP2004/011759 WO2005018893A1 (ja) | 2003-08-20 | 2004-08-17 | ハニカム成形体の製造方法、ハニカムフィルタの製造方法、及びハニカムフィルタ |
Country Status (4)
Country | Link |
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US (1) | US20060257620A1 (ja) |
EP (1) | EP1657039B1 (ja) |
JP (1) | JP4456077B2 (ja) |
WO (1) | WO2005018893A1 (ja) |
Cited By (16)
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EP1825980A2 (en) | 2006-02-24 | 2007-08-29 | Ibiden Co., Ltd. | Wet mixing apparatus, wet mixing method and method for manufacturing honeycomb structured body |
JP2008266117A (ja) * | 2007-03-29 | 2008-11-06 | Ibiden Co Ltd | ハニカム構造体の製造方法およびハニカム構造体 |
DE112007002036T5 (de) | 2006-08-31 | 2009-07-23 | Ngk Insulators, Ltd., Nagoya | Verfahren zur Herstellung einer Waben-Struktur |
WO2012014681A1 (ja) * | 2010-07-28 | 2012-02-02 | 住友化学株式会社 | グリーン成形体 |
WO2012014684A1 (ja) * | 2010-07-28 | 2012-02-02 | 住友化学株式会社 | グリーン成形体 |
JP2013520393A (ja) * | 2010-02-25 | 2013-06-06 | コーニング インコーポレイテッド | 低熱膨張セラミック体を製造するための組成物および方法 |
US8585945B2 (en) | 2007-03-29 | 2013-11-19 | Ibiden Co., Ltd. | Method of producing honeycomb structure and honeycomb structure |
JP2014166749A (ja) * | 2013-01-31 | 2014-09-11 | Hitachi Metals Ltd | セラミックハニカム構造体の製造方法 |
JP2014201454A (ja) * | 2013-04-01 | 2014-10-27 | 株式会社トクヤマ | 表面処理金属酸化物微粉体の製造方法 |
EP3075717A1 (en) | 2015-03-31 | 2016-10-05 | NGK Insulators, Ltd. | Method for manufacturing ceramic formed body, and apparatus for manufacturing ceramic formed body |
EP3075718A1 (en) | 2015-03-31 | 2016-10-05 | NGK Insulators, Ltd. | Method for manufacturing ceramic formed body, and apparatus for manufacturing ceramic formed body |
JP2016193589A (ja) * | 2015-03-31 | 2016-11-17 | 日本碍子株式会社 | セラミックス成形体の製造方法、及びセラミックス成形体製造装置 |
JP2016193590A (ja) * | 2015-03-31 | 2016-11-17 | 日本碍子株式会社 | セラミックス成形体の製造方法、及びセラミックス成形体製造装置 |
JP2017170869A (ja) * | 2016-03-25 | 2017-09-28 | 日本碍子株式会社 | セラミックス構造体の製造方法 |
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DE102018204468A1 (de) | 2017-03-24 | 2018-09-27 | Ngk Insulators, Ltd. | Herstellungsverfahren einer wabenstruktur |
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JP2006289953A (ja) * | 2005-03-17 | 2006-10-26 | Ngk Insulators Ltd | ハニカム成形体の製造方法 |
US20070105707A1 (en) * | 2005-11-10 | 2007-05-10 | Ngk Insulators, Ltd. | Method for manufacturing honeycomb structure |
WO2008047557A1 (fr) * | 2006-09-28 | 2008-04-24 | Hitachi Metals, Ltd. | Procédé de fabrication d'un filtre en nid d'abeilles céramique |
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ES2341274T3 (es) * | 1999-09-29 | 2010-06-17 | Ibiden Co., Ltd. | Filtro de panal y conjunto de filtro ceramico. |
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- 2004-08-17 EP EP04771720A patent/EP1657039B1/en not_active Expired - Fee Related
- 2004-08-17 WO PCT/JP2004/011759 patent/WO2005018893A1/ja active Application Filing
- 2004-08-17 US US10/567,906 patent/US20060257620A1/en not_active Abandoned
- 2004-08-17 JP JP2005513277A patent/JP4456077B2/ja not_active Expired - Fee Related
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JPH09299730A (ja) * | 1996-05-09 | 1997-11-25 | Matsushita Electric Ind Co Ltd | 排ガスフィルタ |
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Cited By (24)
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EP1825980A2 (en) | 2006-02-24 | 2007-08-29 | Ibiden Co., Ltd. | Wet mixing apparatus, wet mixing method and method for manufacturing honeycomb structured body |
DE112007002036T5 (de) | 2006-08-31 | 2009-07-23 | Ngk Insulators, Ltd., Nagoya | Verfahren zur Herstellung einer Waben-Struktur |
US8974723B2 (en) | 2006-08-31 | 2015-03-10 | Ngk Insulators, Ltd. | Process for producing honeycomb structure |
DE112007002036B4 (de) | 2006-08-31 | 2018-03-29 | Ngk Insulators, Ltd. | Verfahren zur Herstellung einer Waben-Struktur |
JP2008266117A (ja) * | 2007-03-29 | 2008-11-06 | Ibiden Co Ltd | ハニカム構造体の製造方法およびハニカム構造体 |
US8585945B2 (en) | 2007-03-29 | 2013-11-19 | Ibiden Co., Ltd. | Method of producing honeycomb structure and honeycomb structure |
JP2013520393A (ja) * | 2010-02-25 | 2013-06-06 | コーニング インコーポレイテッド | 低熱膨張セラミック体を製造するための組成物および方法 |
US9932272B2 (en) | 2010-02-25 | 2018-04-03 | Corning Incorporated | Compositions and methods for making low thermal expansion ceramic bodies |
WO2012014681A1 (ja) * | 2010-07-28 | 2012-02-02 | 住友化学株式会社 | グリーン成形体 |
WO2012014684A1 (ja) * | 2010-07-28 | 2012-02-02 | 住友化学株式会社 | グリーン成形体 |
JP2014166749A (ja) * | 2013-01-31 | 2014-09-11 | Hitachi Metals Ltd | セラミックハニカム構造体の製造方法 |
JP2014201454A (ja) * | 2013-04-01 | 2014-10-27 | 株式会社トクヤマ | 表面処理金属酸化物微粉体の製造方法 |
JP2016193589A (ja) * | 2015-03-31 | 2016-11-17 | 日本碍子株式会社 | セラミックス成形体の製造方法、及びセラミックス成形体製造装置 |
JP2016193590A (ja) * | 2015-03-31 | 2016-11-17 | 日本碍子株式会社 | セラミックス成形体の製造方法、及びセラミックス成形体製造装置 |
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US10252442B2 (en) | 2015-03-31 | 2019-04-09 | Ngk Insulators, Ltd. | Method for manufacturing ceramic formed body, and apparatus for manufacturing ceramic formed body |
JP2017170869A (ja) * | 2016-03-25 | 2017-09-28 | 日本碍子株式会社 | セラミックス構造体の製造方法 |
US10556365B2 (en) | 2016-03-25 | 2020-02-11 | Ngk Insulators, Ltd. | Method of manufacturing ceramic structure |
DE102017204609A1 (de) | 2016-03-29 | 2017-10-05 | Ngk Insulators, Ltd. | Verfahren zum Vorhersagen einer Formkörperdichte und Verfahren zum Herstellen eines Keramik-Brandkörpers |
US10677702B2 (en) | 2016-03-29 | 2020-06-09 | Ngk Insulators, Ltd. | Method of predicting formed body density and method of manufacturing ceramic fired body |
DE102018204468A1 (de) | 2017-03-24 | 2018-09-27 | Ngk Insulators, Ltd. | Herstellungsverfahren einer wabenstruktur |
JP2018161765A (ja) * | 2017-03-24 | 2018-10-18 | 日本碍子株式会社 | ハニカム構造体の製造方法 |
US11542205B2 (en) | 2017-03-24 | 2023-01-03 | Ngk Insulators, Ltd. | Manufacturing method of honeycomb structure |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005018893A1 (ja) | 2007-11-01 |
JP4456077B2 (ja) | 2010-04-28 |
EP1657039A1 (en) | 2006-05-17 |
WO2005018893B1 (ja) | 2005-05-26 |
EP1657039A4 (en) | 2008-12-24 |
US20060257620A1 (en) | 2006-11-16 |
EP1657039B1 (en) | 2011-10-26 |
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