WO2004003276A1 - 保持材用無機質短繊維集積体、その製造方法、及び保持材 - Google Patents
保持材用無機質短繊維集積体、その製造方法、及び保持材 Download PDFInfo
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- WO2004003276A1 WO2004003276A1 PCT/JP2003/008135 JP0308135W WO2004003276A1 WO 2004003276 A1 WO2004003276 A1 WO 2004003276A1 JP 0308135 W JP0308135 W JP 0308135W WO 2004003276 A1 WO2004003276 A1 WO 2004003276A1
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- 239000000835 fiber Substances 0.000 title claims abstract description 134
- 239000000463 material Substances 0.000 title claims abstract description 75
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 47
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 29
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- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 229910052782 aluminium Inorganic materials 0.000 description 2
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- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
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- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- RKFMOTBTFHXWCM-UHFFFAOYSA-M [AlH2]O Chemical compound [AlH2]O RKFMOTBTFHXWCM-UHFFFAOYSA-M 0.000 description 1
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- 150000001298 alcohols Chemical class 0.000 description 1
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- KRGNPJFAKZHQPS-UHFFFAOYSA-N chloroethene;ethene Chemical compound C=C.ClC=C KRGNPJFAKZHQPS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C04B35/62227—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products obtaining fibres
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- C04B35/62245—Fibres based on silica rich in aluminium oxide
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- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43838—Ultrafine fibres, e.g. microfibres
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
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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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- 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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
- F01N3/2825—Ceramics
- F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
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- B01J35/612—Surface area less than 10 m2/g
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
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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
- F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
- F01N2450/02—Fitting monolithic blocks into the housing
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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
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
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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
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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
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249924—Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity
Definitions
- the present invention relates to an inorganic short fiber assembly for a holding material, a method for producing the same, and a holding material.
- the holding material of the present invention includes a holding material for fixing a catalyst carrier for an automotive exhaust gas purifying catalytic converter (hereinafter, referred to as a catalytic converter) and a honeycomb body for a diesel particulate filter (hereinafter, referred to as a DPF). It is a holding material for fixing, and a joint material for high-temperature refractories.
- catalytic converters have been used to detoxify harmful components such as CO and NO x contained in exhaust gas from internal combustion engines.
- the structure of the catalytic converter is such that a holding material is placed between the catalyst carrier and a metal shell that covers the outside of the catalyst carrier.
- the role of the holding material is to prevent damage to the catalyst carrier due to vibration and the like. This is to prevent leakage of exhaust gas (Japanese Patent Application Laid-Open No. 11-82006).
- As the holding material alumina fiber laminates are becoming widespread from the viewpoints of responding to high exhaust gas temperatures to improve fuel efficiency and long-term use stability (Japanese Patent Application Laid-Open No. 7-286651). No. 4).
- the heat-resistant temperature of alumina fibers is set to about 130 to 170 ° C from the shrinkage rate of the fibers under heating, etc., and it is used in an atmosphere of about 100 ° C. Was thought to be sufficient.
- the present inventors consider that when a compressive force is applied for a long period of time under heating at about 100 ° C., as in the case of a DPF holding material, it is attributed to fatigue rupture, creep phenomenon, and the like. It was found that the deterioration of the resulting fiber was significantly more advanced than expected.
- the restoring force (repulsion pressure) is reduced due to the minute deterioration of the holding material, and the honeycomb and the like can be sufficiently removed.
- the holding material may be gradually eroded, and a gap may be formed between the honeycomb and the holding material, and a leak of the exhaust gas may occur. was there.
- an object of the present invention is to provide a holding material that has little fiber deterioration and excellent wind erosion resistance even when a compressive force is applied for a long time under heating at about 1000 ° C.
- Another object of the present invention is to provide an inorganic short fiber assembly used for manufacturing the holding material and a method for manufacturing the same. Disclosure of the invention
- the object of the present invention is to provide an aggregate wherein the aggregate has a specific specific surface area, and a predetermined number or more of the inorganic short fibers constituting the aggregate have a specific fiber diameter; It has been found that this can be achieved by using an aggregate having the chemical composition described above and having an average fiber diameter in a specific range.
- the inorganic short fiber aggregate is manufactured by discharging a spinning stock solution having a specific composition from a hollow disk having a specific structure under specific conditions to produce fibers, and drying, accumulating, and firing under specific conditions. Was issued.
- the present invention has the following features.
- An inorganic short fiber aggregate whose specific surface area is 10 m 2 Zg or less, and whose number of 99% or more (including 100%) fiber diameter is 1.5 to 15 m
- the chemical composition of the inorganic short fibers is 74-86% by mass of the alumina component, 26-14% by mass of the silica component, the mineral composition is 15-60% by mass of mullite, and the average fiber diameter is 2%.
- a holding material comprising a sheet-like molded body containing an organic binder in a void portion of the integrated body according to (1), (2) or (3).
- the holding material is a holding material for fixing a catalyst carrier of a catalytic converter for purifying an automobile exhaust gas or a holding material for fixing a honeycomb for a diesel particulate filter.
- the chemical composition of the inorganic short fibers that constitute the inorganic short fiber aggregate for a holding material of the present invention (hereinafter, also simply referred to as the aggregate) has an alumina component of 74 to 86% by mass, preferably 78 to 82% by mass. And the silica component is 26 to 14% by mass, preferably 22 to 18% by mass.
- Such a chemical composition is obtained by mixing an aqueous solution of oxychloride aluminum at the time of preparing a spinning dope and a sily sol with a desired alumina-force ratio. Can be achieved by: This is it.
- the heat resistance is high, the inferiority due to the high-temperature exhaust gas is reduced, and the holding material manufactured by this integrated body has a large repulsive pressure when a compressive force is applied, Since wind erosion due to exhaust gas is suppressed, the buffering function of the holding material and the holding performance of the catalyst carrier and the honeycomb are improved.
- the total of the alumina component and the silica component is preferably a 1 0 0 wt%, F e 2 0 3, N a 2 0, can tolerate C A_ ⁇ like to less than 1% by weight in total
- the mineral composition of the inorganic short fibers is 15 to 60% by mass of mullite, preferably 20 to 40% by mass, and the balance is alumina, a spinel-type compound derived from silica, intermediate alumina, and low crystalline silica. One or more of mineral, amorphous, etc. If the mullite content is less than 15% by mass, the repulsion pressure during long-term compression holding under heating at about 100 ° C. is significantly reduced.
- the mineral composition can be adjusted by changing the maximum firing temperature of the precursor fibers of the aggregate.
- the measurement of mullite can be performed by determining the peak intensity of mullite by an X-ray diffraction method using a CuKa line and using a calibration curve prepared from the peak intensity of known mullite-containing alumina short fibers.
- the average fiber diameter of the inorganic short fibers must be 2 to 8 / xm. If the average fiber diameter is less than 2 m, the resilience pressure when the holding material manufactured using the same is compressed in the thickness direction becomes small, and the holding force of the honeycomb or the like becomes insufficient. On the other hand, if the average fiber diameter exceeds 8 ⁇ m, the brittle nature of the inorganic short fibers becomes remarkable and breakage easily occurs, and the number of inorganic short fibers per unit volume of the holding material decreases. As a result, the repulsion pressure is significantly reduced, and the holding force of the honeycomb or the like becomes insufficient.
- the preferred average fiber diameter is 2.5 to 5 m.
- the average fiber diameter is defined as an average value of fiber diameters of 100 or more inorganic short fibers measured from a SEM photograph.
- the aggregate of the present invention is an aggregate of the above inorganic short fibers, has a specific surface area of 1 O m 2 / g or less, and has a fiber diameter of 1% or more (including 100%). It is composed of inorganic short fibers of 5 to 15 m. If the specific surface area of the aggregate exceeds 1 Om 2 / g, the brittle nature of the inorganic short fibers becomes prominent, and the holding power of the honeycomb or the like becomes insufficient. In addition, the underwater specific gravity described later also increases.
- the preferred specific surface area is 5 m 2 Zg or less. Here, the specific surface area is measured by the BET method.
- the fiber diameter of the inorganic short fibers forming the aggregate is 1 If the total of less than 5 m and more than 15 im is not less than 1% by mass, many fibers that do not function for holding force such as honeycomb will be contained, and the holding material manufactured using it will be compressed in the thickness direction. The repulsion pressure in the case of performing is reduced, and the holding force of the honeycomb or the like becomes insufficient. In addition, the brittle nature of the inorganic short fibers becomes remarkable, and the buffer function of the holding material is likely to deteriorate.
- 99% or more (including 100%) of the number of inorganic short fibers have a fiber diameter of 2 to 10 ⁇ m.
- the fiber diameter of 99% or more (including 100%) of such inorganic short fibers can be measured from an SEM photograph of 1000 or more inorganic short fibers.
- the number of the fiber diameters of the aggregate is adjusted in the method of manufacturing the aggregate of the present invention described below, wherein the viscosity of the spinning stock solution is 1000 to 8000 mPa-s, and the diameter of the hole provided on the circumference of the hollow disk is 0. 1 to 0.3 mm, supply per holeDischarge rate 8 to 20 m1Zhr, peripheral speed of hollow disk 30 to 8 OmZec To control one or more of these factors within the range Can be done by Adjustment of the specific surface area is performed by combining an aggregate of inorganic short fibers before firing (hereinafter, also referred to as “precursor fibers”) in the first half of the continuous furnace with a wind speed in the furnace of 1 to 5 mZ sec.
- precursor fibers an aggregate of inorganic short fibers before firing
- the temperature was raised from room temperature to 800 to 1000 ° C at 10 to 20 ° C / in, thereby mainly removing water, chlorine, spinning aids, etc. In the latter half, by raising the temperature to a maximum temperature of 1200 to 1300 at 20 to 30 ° C / min and holding at that maximum temperature for 15 to 30 minutes, by controlling one or more of these factors It can be carried out.
- the water flow rate of 0.501 Zmin is a classification point corresponding to a spherical shape of 30 m
- the flow rate of 1.381 / min is a spherical shape of 50 Aim
- the flow rate of 5.541 / min is a spherical shape of 100 xm This is the corresponding classification point.
- the viscosity of the spinning stock solution is particularly controlled to 1000 to 8000 mPa-s and the peripheral speed of the hollow disk to 30 to 80 mZsec in the method for producing the aggregate of the present invention described later.
- the specific gravity of bulk in water, which is an index of fiber strength, determined from the settled volume is preferably from 0.01 to 0.025, and particularly preferably.
- the fiber strength becomes weak, and the holding material of the sheet-like molded body made from such an aggregate becomes easily eroded by the exhaust gas, and is likely to be caught between the honeycomb and the like. There is a possibility that a gap may be formed in the exhaust gas, and exhaust gas leaks and honeycomb may fall out. Further, if the specific gravity of the underwater bulk is less than 0.012, the fiber strength becomes too strong, and when the aggregate is formed into a sheet, the defibration becomes uneven, so that the thickness of the sheet-shaped formed body becomes uneven. The holding power of the honeycomb and the like becomes insufficient.
- Adjustment of the underwater bulk specific gravity of the aggregate is performed by the method of manufacturing the aggregate of the present invention, which will be described later, by controlling the viscosity of the spinning stock solution and the supply and discharge amount per hole, the peripheral speed of the hollow disk, and the firing of the precursor fiber. Article This can be done by controlling one or more of the cases.
- an aqueous solution of aluminum oxychloride having a transmittance of 80% or more as an alumina component and a silica sol having a transmittance of 75% or more as a silica component are used, and the component ratio is preferably 74 to 86% by mass, particularly alumina. It is preferably 77 to 82% by mass, and both are mixed so that the sily power is preferably 26 to 14% by mass, particularly preferably 22 to 18% by mass, and a spinning aid is further added. Then, a spinning dope having a viscosity of preferably 100 to 80 OO mPa * s is prepared. The spinning aid imparts viscosity to the solution containing the alumina and silica components to make it viscous. For example, polyvinyl alcohol, starch, polyethylene oxide, polyethylene glycol and the like are used.
- the transmittance of hydroxy aluminum is less than 80% or the transmittance of silica sol is less than 75%, the brittle nature of the inorganic short fibers becomes remarkable, and the buffer function of the holding material is likely to deteriorate.
- the spinning stock solution gels, and the inorganic short fibers constituting the aggregate contain a large amount of coarse crystals, and the specific gravity of the underwater bulk increases significantly.
- the firing temperature for obtaining the desired mineral composition becomes very unstable, and it becomes difficult to control the temperature. Transmittance is measured by the spectrophotometric method.
- the viscosity of the spinning stock solution is less than 100 OmPas, the spinnability is poor, causing shots. If the viscosity exceeds 800 OmPas, the average fiber diameter of the inorganic short fibers is extremely large. And the specific gravity of underwater bulk also increases.
- the preferred viscosity of the spinning dope is 150 to 600 OmPas.
- this spinning stock solution is supplied at a rate of 8 to 2 Oml / hr into a hollow disk provided with a plurality of holes having a diameter of 0.1 to 0.3 mm on the circumferential surface, and discharged therefrom.
- the fibers are made to dangle. This fiberization is performed by rotating the hollow disk at a peripheral speed of 30 to 8 OmZsec.
- the supply / discharge amount per hole is calculated by dividing the supply amount per hour of the spinning solution supplied to the hollow disk by the number of holes provided on the circumferential surface of the hollow disk.
- the diameter of the holes exceeds the range of 0.1 to 0.3 mm, it becomes difficult to obtain a desired fiber diameter, and the spinnability becomes poor, which causes shots.
- the preferred hole diameter is between 0.2 and 0.28 mm.
- the supply amount per hole is 8 m 1 Z If the rotation speed is less than hr or the peripheral speed of the rotating disk is less than 3 Om / sec, the spinnability is poor, causing shots. If the supply amount per hole exceeds 2 Oml / hr, the inorganic material becomes short. The average fiber diameter of the fiber becomes significantly larger, and the specific gravity of underwater bulk increases. On the other hand, when the peripheral speed of the rotating disk exceeds 8 OmZs ec, the fibers become thinner than necessary and the operation becomes more difficult.
- the supply amount per hole is preferably 10 to 18 mlZhr, and the peripheral speed of the rotating disk is preferably 40 to 6 Om / sec.
- the number of holes is preferably at least 200, particularly preferably at least 500, from the viewpoint of productivity
- the liquid thread that has popped out of the hole is accumulated in the cotton collecting chamber while drying to become a precursor fiber, and is then fired to become the aggregate of the present invention. Drying is preferably performed with hot air at 150 to 600 ° C. Accumulation can be performed by sucking the dried liquid thread suspended in the air from below the cotton collection chamber.
- the calcination is performed in an atmosphere using a continuous furnace such as a roller house furnace or a walking beam furnace.
- a continuous furnace such as a roller house furnace or a walking beam furnace.
- the temperature is raised from room temperature to 800 to 1000 ° C, preferably 10 to 20 ° C / min, under the condition that the wind speed in the furnace is preferably l to 5 m / sec.
- the maximum temperature in the latter half of the continuous furnace is raised to a maximum temperature of 1200-1300 ° C, preferably 20-30 ° C. By holding at this maximum temperature, preferably for 15 to 30 minutes.
- the in-furnace wind speed is less than lmZs ec, the removed chlorine and organic components in the spinning aid will stay in the furnace, adversely affect the fiber properties, and the in-furnace wind speed will exceed 5 m / sec. This makes it difficult to control the temperature inside the furnace.
- the firing temperature in the first half of the continuous furnace is lower than 800, the organic components contained in the spinning aid are not completely removed. The bulk specific gravity becomes significantly worse. If the firing temperature in the first half is 1000 ° C or higher, the furnace length in the first half of the continuous furnace must be made longer than necessary.
- the furnace length of the first half of the continuous furnace must be longer than necessary to achieve the desired temperature.
- the temperature exceeds 30 ° C / min, the organic component in the precursor is ignited due to rapid heating, and the specific surface area and the specific gravity of bulk in water are remarkably deteriorated.
- the maximum temperature in the latter half of the continuous furnace exceeds the range of 1200-1300 ° C, It is difficult to obtain the desired degree of crystallinity of mullite. If the heating rate in the latter half of the continuous furnace is less than 20 ° C / min, the furnace length in the latter half of the continuous furnace must be made longer than necessary to achieve the desired temperature.
- the speed exceeds 0 ° CZmin, rapid heating may cause unevenness in the mullite crystallinity in the thickness direction of the integrated body.
- the holding time at the maximum temperature is less than 15 minutes, the crystallinity of the uniform may be uneven in the thickness direction of the integrated body. Need to be longer than necessary.
- the holding material of the present invention is formed of a sheet-like molded product in which an organic binder is contained in the voids of the aggregate of the present invention.
- the aggregate bound by the organic binder is released by the burning of the organic binder due to heating during use, and the aggregate expands in the thickness direction to generate a repulsive pressure.
- the honeycomb of the DPF, the catalyst carrier of the catalyst compa- rator, and the like can be held, and the displacement of the honeycomb force, the catalyst carrier, and the like, the falling-off damage, and the like can be reduced.
- a papermaking method is preferable.
- a method using continuous papermaking equipment such as a round net paper machine and a fourdrinier paper machine, a batch papermaking method in which a slurry is poured into a papermaking pox, and a method in which the slurry is fed from a slurry into a flat net can be used. it can.
- the mixing of the organic binder at this time is performed by mixing a predetermined amount of the inorganic short fiber and the organic binder in advance to form a slurry, or forming a slurry of only the inorganic short fiber into a cake, and then forming a solution containing the organic binder from above. Can be sprayed and sucked from below, or both can be used in combination.
- the drying of the cake is preferably carried out while applying a compressive force while holding it at a clearance corresponding to 40 to 100% of the desired thickness after drying.
- a liner is inserted between two perforated plates to secure a certain distance between the paper cake and the plate, and drying is performed in a dryer. Rollers are installed, during which the cake cake is dried through the cake.
- the content of the organic binder is preferably from 0.5 to 10% by mass, particularly preferably from 3 to 6% by mass.
- catalytic converters and DPFs When the organic binder burns and burns off due to the exhaust gas of the vehicle, etc., it expands in the thickness direction of the holding material, and the repulsive pressure of the aggregate easily appears.
- the content of the organic binder is less than 0.5% by mass, this effect is small, and if it exceeds 10% by mass, the organic binder is burned off in an incompletely combusted state, generating reducing gas and exhausting automobiles. There is a risk of causing malfunction of various sensors installed in the system, so it is necessary to take additional measures.
- the organic binder is preferably an organic binder that is burned off at a temperature of preferably 700 ° C. or less, particularly preferably 200 ° C. to 500 ° C., and has an adhesive force to suppress the repulsive pressure of the aggregate.
- the papermaking slurry is prepared by mixing and fluidizing the inorganic short fibers and the medium.
- the medium water, an organic medium or both are used.
- the organic medium include alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol, aromatic hydrocarbons such as benzene and toluene, aliphatic solvents such as acetone and chloroform, and heterocyclic solvents such as tetrahydrofuran. Is used.
- the slurry concentration that is, the content ratio of the inorganic short fibers in the slurry is preferably from 0.25 to 0.7% by mass, particularly preferably from 0.2 to 0.5% by mass. Are preferred.
- the holding material of the present invention can be used not only as a holding material for fixing a catalyst carrier in a catalyst converter, as a holding material for holding a DPF honeycomb, but also as a joint material for high-temperature refractories.
- aqueous solution of oxyaluminum chloride with a transmittance of 90% as the alumina component and a silica sol with a transmittance of 90% as the silica component the alumina becomes 70 to 98% by mass and the silica 30 to 2% by mass (total 100% by mass of both). Both were mixed as described above, and polypinyl alcohol was further added as a spinning aid to prepare a spinning solution having a viscosity of 500 OmPa ⁇ s.
- This spinning stock solution is supplied at a rate of 15 mlZhr per hole into a 150 mm diameter hollow disc having 300 0.25 mm diameter holes on the circumferential surface, and the disc is rotated at a peripheral speed of 50 mZsec.
- the spinning stock solution was converted into fibers (liquid yarn), and dried and dried by hot air of 300 T, sucked and collected from the lower part of the cotton collection chamber to produce precursor fibers.
- the temperature is increased from room temperature to 900 at a rate of 15 / min in the first half of the roller house furnace at a wind speed of 3 mZs ec, and then in the second half of the continuous furnace to a maximum temperature of 1250 ° C.
- baking was performed at the highest temperature for 20 minutes to produce an integrated body shown in Table 1, which was cut into a length of 25 mm and a width of 25 mm.
- the evaluation of wind erosion resistance was carried out by measuring the specific gravity of underwater seams, and the stirrer used was PROMI X PR-1200 (four blades, blade diameter 75 mm) manufactured by Shibata.
- Cu C ⁇ indicates that the remainder of the mineral composition is one or more of alumina, a spinel-type compound derived from silica, intermediate alumina, a low-crystalline silica mineral, and amorphous. It was confirmed by X-ray diffraction by X-ray.
- the obtained holding material In order to evaluate the performance of the obtained holding material, it was baked at 700 ° C in an electric furnace to remove the binder, and the compressed bulk density (GBD) was 0.15 g / cm 3 and 0.30 gZcm 3 Compressed to 0.45 g / cm 3 , Rebound pressure at 0 hours after compression at room temperature, Rebound pressure at 20 hours after compression at room temperature, 20 hours after compression at 1000 ° C
- the subsequent rebound pressure was measured using a compression tester (“TC-1210A” manufactured by A & D Corporation).
- TC-1210A manufactured by A & D Corporation
- Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Transmittance of aluminum oxychloride (%) qn Transmittance of silica sol (%)
- G. ⁇ . D 0.45 (g / cm) 910 900 870 960 660
- Example 1 was repeated except that an aqueous solution of aluminum oxychloride having a transmittance of 70 to 80% and a silica sol having a transmittance of 65 to 75% were mixed so as to be 80% by mass of alumina and 20% by mass of silica.
- the operation was performed under the same conditions as described above. Table 2 shows the results.
- Example 4 Comparative Example 3 Comparative Example 4 Comparative Example 5 Chemical composition Alumina (% by mass) 80 80 '80 80 Silica (% by mass) 20 20 20 20 20 Mineral composition Mullite (% by mass) 30 20 20 10 Specific surface area (m 2 / g) 3. 1 5. 2 5. 8 5.6 Average fiber diameter of inorganic short fibers (111) 3.6 3. 2. 3. 53.0 Restrained fiber diameter range of 99% of all fibers 1.8 ⁇ 2.6 ⁇ 1.5 ⁇ 2.7 ⁇ Body KP-rn) 8.0 0.9 6.8.19.6 Recovered flow rate 0.50 (1 / min) 7.8.22.38.22 . 0 27. 0
- G.B.D 0, 45 (g / cm) 860 680 690 660
- An aqueous solution of aluminum oxychloride having a transmittance of 90% and a silica sol having a transmittance of 90% are mixed so as to be 80% by mass of alumina and 20% by mass of silica, and have a viscosity of 300 to 2500 OmPas and a pore diameter of 0.05.
- the operation was performed under the same conditions as in Example 1 except that 11. Omm, the supply amount per hole was 4 to 40 ml / min, and the peripheral speed of the hollow disk was 10 to 9 OmZsec. Tables 3 and 4 show the results.
- Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Permeability of aluminum oxychloride (%) 90
- Example 5 Example 6
- Example 7 Example 8
- Example 9 Example 10
- Example 12 Chemical composition Alumina (% by mass) 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 Silica (% by mass) 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
- Example 5 Example 6
- Example 7 Example 8
- GB D 0.15 (g / cm 3 ) 20 20 17 20 20 20 20 15
- a GB D 0.30 (g / cm 3 ) 200 195 210 195 225 210 215 210
- a mixture of an aqueous solution of oxyaluminum chloride having a transmittance of 90% and a silica sol having a transmittance of 90% is mixed so as to have an alumina content of 80% by mass and a silica content of 20% by mass.
- m / sec from room temperature 700-1100. The operation was carried out under the same conditions as in Example 1 except that the temperature was raised to 5 C to 30 C / min. Tables 5 and 6 show the results.
- Example 13 Example 13
- Example 14 Example 15
- Example 16 Example 17
- Example 18 Permeability of aluminum oxychloride (%) 90 Permeability of silica sol (%) 90 Viscosity of stock solution (.mPa ⁇ s) ) 5000 Hole diameter (mm) .0.25 m Peripheral speed of hollow disk ⁇ sec) 50 Feed per hole (m 1 Z hr 15 Furnace wind speed (/ sec) 1 5 3 3 3 3 3
- Example 13 Example 14 Example 15 Example 16 Example 17 Example 17 Example 18 Chemical composition Alumina (% by mass) 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80
- Example 13 Example 14 Example 15 Example 16 Example 16 Example 17 Example 18
- G.B.D 0.15 (g / cm 3) 46 46 42 40 42 38
- a GB D 0.30 (g / cm J ) 360 365 345 330 355 320
- G.B.D 0.15 (g / cm °) 20 22 20 20 20 20 22 22
- Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 Comparative Example 18 Comparative Example 19 Chemical Composition Alumina (% by mass) 80 80 80 Silica (% by mass) 20 Up to 900 ° C 20 First half of continuous furnace First half of continuous furnace 20 Mineral composition Mullite ( (Mass%) 30 and the furnace length in front of the continuous furnace is 30. The furnace length in the part is 30. Specific surface area (m 2 / g) 14.3 Half temperature 39.6 Insufficient or insufficient 62.3 Average fiber diameter of fiber (m) 3.1
- a 90% transmittance aqueous solution of aluminum oxychloride and a 90% transmittance silica sol are mixed so that 80% by mass of alumina and 20% by mass of silica are mixed.
- the firing conditions in the second half of the continuous furnace are adjusted to a maximum temperature of 1100 ° ⁇ 0
- the operation was carried out under the same conditions as in Example 1 except that the temperature was raised to 1400 at 10 to 40 ° C. Zmin, and the maximum temperature was maintained at 5 to 6 min.
- Example 1 Example 20
- Example 21 Example 22
- Example 23 Example 24 Permeability of aluminum oxychloride (%) 90 Permeability of silica sol (%) 90 Viscosity of stock solution (mPa ⁇ s) 5000 Pore size ( mm) 0.25
- Example 19 Example 20 Example 21 Example 22 Example 23 Example 24 Chemical composition Alumina (% by mass) 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 80 Sil
- Example 19 Example 20 Example 21 Example 22 Example 23 Example 24
- a GB D 0.30 (g / cm 3 ) 400 355 340 330 355 320
- a GB D 0.30 (g / cm 3 ) 435 200
- the aggregate which has a small fiber deterioration even if it keeps compression for a long time under the heating of about 1000 degreeC, the holding material of the catalyst carrier of the catalyst comparator using it, and the honeycomb of DPF.
- a cam retainer and the like are provided. According to the method for manufacturing an integrated body of the present invention, an integrated body having the above characteristics can be easily manufactured.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
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- Inorganic Fibers (AREA)
- Nonwoven Fabrics (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003244001A AU2003244001A1 (en) | 2002-06-28 | 2003-06-26 | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
US10/517,618 US7182999B2 (en) | 2002-06-28 | 2003-06-26 | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
EP20030736275 EP1533409B1 (en) | 2002-06-28 | 2003-06-26 | Inorganic staple fiber accumulation for holding material, process for producing the same and holding material |
JP2004517301A JP4174474B2 (ja) | 2002-06-28 | 2003-06-26 | 保持材用無機質短繊維集積体、その製造方法、及び保持材 |
Applications Claiming Priority (2)
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JP2002190348 | 2002-06-28 | ||
JP2002-190348 | 2002-06-28 |
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WO2004003276A1 true WO2004003276A1 (ja) | 2004-01-08 |
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PCT/JP2003/008135 WO2004003276A1 (ja) | 2002-06-28 | 2003-06-26 | 保持材用無機質短繊維集積体、その製造方法、及び保持材 |
Country Status (7)
Country | Link |
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US (1) | US7182999B2 (ja) |
EP (1) | EP1533409B1 (ja) |
JP (1) | JP4174474B2 (ja) |
CN (1) | CN100359071C (ja) |
AU (1) | AU2003244001A1 (ja) |
WO (1) | WO2004003276A1 (ja) |
ZA (1) | ZA200500474B (ja) |
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JP7006349B2 (ja) | 2017-02-15 | 2022-01-24 | 三菱ケミカル株式会社 | アルミナ繊維、アルミナ繊維集合体及びその製造方法 |
WO2021025058A1 (ja) | 2019-08-06 | 2021-02-11 | 三菱ケミカル株式会社 | 無機繊維成形体、排ガス浄化装置用マット及び排ガス浄化装置 |
KR20220038580A (ko) | 2019-08-06 | 2022-03-29 | 미쯔비시 케미컬 주식회사 | 무기 섬유 성형체, 배기 가스 정화 장치용 매트 및 배기 가스 정화 장치 |
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Publication number | Publication date |
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ZA200500474B (en) | 2006-07-26 |
EP1533409B1 (en) | 2012-06-06 |
EP1533409A4 (en) | 2010-10-27 |
CN1665974A (zh) | 2005-09-07 |
US7182999B2 (en) | 2007-02-27 |
EP1533409A1 (en) | 2005-05-25 |
JPWO2004003276A1 (ja) | 2005-10-27 |
CN100359071C (zh) | 2008-01-02 |
JP4174474B2 (ja) | 2008-10-29 |
US20050227058A1 (en) | 2005-10-13 |
AU2003244001A1 (en) | 2004-01-19 |
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